首页分享控释尿素和普通尿素混合基施对冬小麦氮素吸收利用和产量的影响

控释尿素和普通尿素混合基施对冬小麦氮素吸收利用和产量的影响

来源：花匠小妙招时间：2025-09-24 05:06

摘要:

目的

研究不同施氮量下控释尿素掺混普通尿素对土壤硝态氮含量、冬小麦氮素吸收利用和产量的影响，为陕西关中平原地区冬小麦的高效生产提供依据。

方法

冬小麦田间试验于2020—2022年在陕西省咸阳市进行，供试控释肥(CRU)氮素释放期为90天。试验设置N 192和240 kg/hm2 两个施氮水平 (N1、N2)，在两个施氮水平下设5个肥料处理，即100%普通尿素分两次施用(F1)为对照；控释尿素和普通尿素混合一次性基施，混合比例分别为30%+70% (F2)、50%+50% (F3)、70%+30% (F4)、100%控释尿素 (F5)。在冬小麦越冬、返青、拔节和开花期采集0—40 cm土层土壤样品，每10 cm为1个样品；成熟期采集0—200 cm土层土壤样品，40—200 cm土层每20 cm采集1个样品，测定土壤硝态氮含量。在冬小麦越冬、返青、拔节、开花以及成熟期取植株地上部样品，开花期分为穗、茎秆+叶鞘、叶片3个部分，成熟期分为籽粒、颖壳+穗轴、茎秆+叶鞘、叶片4个部分，称取干物质质量，测定氮素含量。于小麦成熟期测定产量。

结果

越冬期0—20 cm土层硝态氮含量F2处理较高，返青期后则以F4和F5处理较高，且F4和F5处理成熟期80—200 cm土层的硝态氮含量显著低于其他掺混肥处理。相比其他处理，F4和F5处理显著增加穗数，进而显著提高产量。在F2和F3处理下，N2与N1水平小麦平均产量无显著差异；在F4和F5处理N2水平的小麦平均产量高于N1水平，净效益平均分别提高10.08%和6.41%，氮素利用效率无显著差异。相比F1处理，F4处理花前氮素向籽粒的转运量平均提高18.63%，籽粒氮素积累量平均提高16.96%。相关性分析表明，拔节期0—20 cm土层硝态氮含量与花前氮素向籽粒转运量呈显著正相关，开花期0—20 cm土层硝态氮含量与花前氮素转运量和花后氮素积累量呈显著正相关。

结论

较高的开花期氮素积累量可增加营养器官氮素向籽粒的再分配量，实现冬小麦产量和氮素利用效率的同步提升。与分次施用普通尿素N 240 kg/hm2相比，采用控释期90天的树脂包膜尿素与普通尿素按70%∶30%掺混一次性基施，能显著提高冬小麦返青期至开花期的土壤硝态氮含量，减少成熟期80—200 cm土层土壤硝态氮含量，从而增加开花期总茎数及植株氮素积累量，显著提高成穗数、籽粒产量和氮素利用率。

Abstract:

Objectives

We investigated the effect of the mixed application of controlled release urea (CRU) with common urea (CU) on the yield, relocation of accumulated N to grains, and soil nitrate contents at different stage of winter wheat, to serve the efficient production of winter wheat in Guanzhong Plain, Shaanxi Province.

Methods

A winter wheat field experiment was conducted in Xianyang, Shanxi Province from 2020 to 2022, the tested CRU is resin coated urea with N release period of 90 days. Two N application amounts 192 and 240 kg/hm2 were set up, and five mix ratio treatments were included under each N rate, as: CU control (as basal and topdressing fertilizer, F1), and basal application of CRU and CU in mix ratio of 30%+70% (F2), 50% +50% (F3), 70%+30% (F4), and 100%CRU (F5). At the main growth stages of winter wheat, 0−40 cm deep soil samples were collected with one sample every 10 cm, and at maturity stage, 0−200 cm soil samples were collected with one sample every 20 cm for the determination of nitrate concentration. At the overwintering, regreening, jointing, flowering, and maturing stages of wheat, wheat plants were sampled for the above ground biomass and N content analysis. The plant samples at flowering stage were divided into three parts (ear, stem and sheath, and leaves), and at maturing stage were divided into four parts (grains, glume + rachis, stem + sheath, leaves) for the measurement of N content. And the yield and yield components were investigated at maturing stage.

Results

F2 treatment was recorded the highest NO3−-N in 0−20 cm soil layer before regreening stage; F4 and F5 treatment were recorded the lowest NO3−-N at regreening stage, and that in the 80−200 cm soil layer at maturing stage, while achieved significantly higher yield than the other treatments due to the higher number of spikes. F2 and F3 treatments achieved similar yields on average under both N2 and N1 rate. F4 and F5 treatments had higher yields under N2 rate than under N1 rate, thereby their net benefits under N2 increased by 10.08% and 6.41% than under N1 rate, and the N internal utilization efficiency were not changed significantly. Compared with F1, the relocation amount of pre-anthesis N accumulation to grain was averagely increased by 18.63%, and the grain N accumulation increased by16.96% in F4 treatment. The 0−20 cm soil NO3−-N at jointing stage was positively correlated with the relocation amount of pre-anthesis N accumulation to grain. There was a positive (P<0.05) correlation between 0−20 cm soil NO3−-N at anthesis stage and the N transport at pre-anthesis stage and N accumulation at post-anthesis stage.

Conclusions

Properly high N accumulation during anthesis stage is beneficial to the relocation of N from vegetative organs to grains, and the increase of winter wheat yield and N utilization efficiency as result. Complete basal application of N 240 kg/hm2 in ratio of 70% resin coated urea with 30% ordinary urea could maintain high nitrate concentration in 0−20 cm soil from regreening to anthesis stage of winter wheat, so promoting the total number of stems and spikelet, increasing the plant N accumulation during anthesis period, and leave low NO3−-N in 80−200 cm soil layer at harvest.

图 1 2020—2022年日均降水量及日均温度变化

Figure 1. Daily average precipitation and daily average temperature change in 2020—2022

图 2 2020—2021年不同处理冬小麦生育期内0—40 cm土层硝态氮含量动态变化

注：WS—越冬期；RGS—返青期；JS—拔节期；AS—开花期；MS—成熟期。N1和N2分别表示施氮量为 192和240 kg/hm2；F1处理为普通尿素分两次施用，F2、F3、F4、F5处理为控释尿素和普通尿素混合一次性基施，其中控释肥氮素比例依次为30%、50%、70%、100%。

Figure 2. Dynamics of nitrate concentration in 0−40 cm soil layer of each treatment across winter wheat season in 2020−2021

Note: WS—Overwintering stage; RGS—Regreening stage; JS—Jointing stage; AS—Anthesis stage; MS—Maturity stage. N1 and N2 indicate N application rate of 192 and 240 kg/hm2; F1 indicates common urea as base and topdressing fertilizer, F2, F3, F4, and F5 indicate complete basal application of controlled release and common urea with the controlled release urea N ratio of 30%, 50%, 70%, and 100%, respectively.

图 3 2021—2022年不同处理小麦生育期内0—40 cm土层硝态氮含量动态变化

Figure 3. Dynamics of nitrate concentration in 0−40 cm soil layer of each treatment across winter wheat season in 2021−2022

图 4 2020—2022年冬小麦成熟期各处理0—200 cm土层硝态氮含量

注：N1和N2分别表示施氮量为 192和240 kg/hm2；F1处理为普通尿素分两次施用，F2、F3、F4、F5处理为控释尿素和普通尿素混合一次性基施，其中控释肥氮素比例依次为30%、50%、70%、100%。

Figure 4. Nitrate concentration in 0−200 cm soil layer of each treatment at mature stage of winter wheat from 2020−2022

Note: N1 and N2 indicate N application rate of 192 and 240 kg/hm2; F1 indicates common urea as base and topdressing fertilizer, F2, F3, F4, and F5 indicate complete basal application of controlled release and common urea with the controlled release urea N ratio of 30%, 50%, 70%, and 100%, respectively.

图 5 不同处理对冬小麦各生育时期氮素积累量的影响

注：WS—越冬期；RGS—返青期；JS—拔节期；AS—开花期；MS—成熟期。N1和N2分别表示施氮量为 192和240 kg/hm2；F1处理为普通尿素分两次施用，F2、F3、F4、F5处理为控释尿素和普通尿素混合一次性基施，其中控释肥氮素比例依次为30%、50%、70%、100%。柱上不同小写字母表示处理间差异显著(P<0.05)。

Figure 5. Effects of different treatments on nitrogen accumulation in winter wheat at different growth stages

Note: WS—Overwintering stage; RGS—Regreening stage; JS—Jointing stage; AS—Anthesis stage; MS—Maturity stage. N1 and N2 indicate N application rate of 192 and 240 kg/hm2; F1 indicates common urea as basal and topdressing fertilizer, F2, F3, F4, and F5 indicate complete basal application of controlled release and common urea with the controlled release urea N ratio of 30%, 50%, 70%, and 100%, respectively. Different lowercase letters on the bars indicate significant difference among treatments (P<0.05).

图 6 不同处理冬小麦各生育时期总茎数

Figure 6. Total stem number of winter wheat at different growth stages under different treatments

Note: WS—Overwintering stage; RGS—Regreening stage; JS—Jointing stage; AS—Anthesis stage; MS—Maturity stage. N1 and N2 indicate N application rate of 192 and 240 kg/hm2; F1 indicates common urea as basal and topdressing fertilizer, F2, F3, F4, and F5 indicate complete basal application of controlled release and common urea with the controlled release urea N ratio of 30%, 50%, 70%, and 100%, respectively. Different lowercase letters on the bars indicate significant difference among treatments (P<0.05).

图 7 冬小麦氮素积累与转运和0—20 cm土层硝态氮含量相关性

注： WS—越冬期；RGS—返青期；JS—拔节期；AS—开花期；MS—成熟期。NRA—花前氮素转运量；NRCT—开花前氮素对籽粒氮的贡献率；NAG—花后氮素积累量：NACT—花后氮素对籽粒氮的贡献率；NAM—成熟期氮素积累量；NS—穗数；GY—谷物产量；NUtE—氮素利用效率。*—P<0.05；**—P<0.01。

Figure 7. Correlation between nitrogen accumulation and transport in winter wheat and nitrate content in 0−20 cm soil layer

Note: WS—Wintering stage; RGS—Regreening stage; JS—Jointing stage; AS—Anthesis stage; MS—Maturity stage. NRA—Nitrogen relocation amount in vegetative organs; NRCT—Total contribution rate of pre-anthesis N relocation to grain N; NAG—Nitrogen uptake amount after anthesis; NACT—Contribution rate of post-anthesis N accumulation to grain N; NAM—Nitrogen accumulation at maturity; NS—Number of spikes; GY—Grain yield; NUtE—Nitrogen utilization efficiency. *—P<0.05; **—P<0.01.

图 8 花前、花后氮素对籽粒氮的贡献率和开花期氮素积累量间的拟合关系

Figure 8. Fitting relationship between NRCT, NACT, and nitrogen accumulation at anthesis stage

Note: NRCT—Total contribution rate of nitrogen remobilization pre-anthesis to grain nitrogen; NACT—Contribution rate of nitrogen accumulated post-anthesis to the grain nitrogen.

表 1 播种前0—20 cm土层土壤理化性质

Table 1 Physiochemical properties of 0−20 cm soil layer before sowing

年度
Year 有机质 (g/kg)
Organic matter 全氮 (g/kg)
Total N 碱解氮 (mg/kg)
Hydrolysable N 速效磷 (mg/kg)
Available P 速效钾 (mg/kg)
Available K 2020—2021 15.0 0.97 64.1 10.4 220.2 2021—2022 16.1 0.93 54.5 20.7 231.5

表 2 不同处理施氮量(kg/hm2)

Table 2 Nitrogen application rate of different treatments

处理
Treatment 控释氮肥 (CRU)
Controlled release urea 尿素
Urea 总施氮量
Total N input N1F1 0.0 192.0 192.0 N1F2 57.6 134.4 192.0 N1F3 96.0 96.0 192.0 N1F4 134.4 57.6 192.0 N1F5 192.0 0.0 192.0 N2F1 0.0 240.0 240.0 N2F2 72.0 168.0 240.0 N2F3 120.0 120.0 240.0 N2F4 168.0 72.0 240.0 N2F5 240.0 0.0 240.0

表 3 不同处理冬小麦成熟期氮素在各器官中的分配

Table 3 Nitrogen distribution in various organs of winter wheat at maturing stage under different treatments

年度
Year 处理
Treatment 氮积累量 N accumulation (kg/hm2) 分配比例 Distribution proportion (%) 籽粒
Grain 茎秆+叶鞘
Stem and sheath 叶片
Leaf 颖壳+穗轴
Spike axis and glume 籽粒
Grain 茎秆+叶鞘
Stem and sheath 叶片
Leaf 颖壳+穗轴
Spike axis and glume 2020—2021 N1 F1 192.32 b 43.13 a 12.33 a 13.76 ab 73.53 c 16.49 a 4.72 b 5.26 b F2 180.45 c 37.05 c 13.78 a 15.11 a 73.24 c 15.04 b 5.59 a 6.14 a F3 200.53 b 32.38 d 8.49 c 11.43 c 79.32 a 12.81 c 3.36 c 4.52 c F4 218.98 a 36.67 c 8.33 c 12.10 bc 79.32 a 13.28 c 3.02 c 4.38 c F5 212.98 a 40.00 b 10.33 b 12.12 bc 77.32 b 14.52 b 3.76 c 4.40 c N2 F1 198.75 c 42.43 a 11.73 a 15.56 b 74.03 c 15.80 a 4.37 a 5.80 b F2 189.16 c 40.47 a 9.31 b 17.58 a 73.74 c 15.77 a 3.63 b 6.86 a F3 210.45 b 34.26 b 8.81 c 14.49 c 78.52 b 12.78 b 3.29 c 5.41 c F4 233.29 a 35.15 b 7.67 d 13.57 d 80.53 a 12.14 b 2.65 d 4.69 d F5 233.30 a 35.16 b 8.02 d 13.54 d 80.44 a 12.13 b 2.76 d 4.67 d 显著性检验 Significance test N ** NS ** ** ** ** ** ** F ** ** ** ** ** ** ** ** N×F NS ** ** NS ** ** ** NS 2021—2022 N1 F1 213.49 b 50.26 b 18.28 a 12.28 d 72.54 c 17.08 b 6.21 a 4.17 e F2 181.84 d 56.91 a 17.48 ab 20.12 a 65.80 e 20.59 a 6.32 a 7.28 a F3 203.61 c 51.53 b 19.05 a 19.70 a 69.28 d 17.53 b 6.48 a 6.70 b F4 239.00 a 44.00 c 16.00 bc 17.67 b 75.47a 13.89 d 5.05 b 5.58 c F5 218.57 b 44.37 c 15.59 c 14.41 c 74.61 b 15.14 c 5.32 b 4.92 d N2 F1 219.00 c 51.14 a 19.40 a 22.62 a 70.16 d 16.38 b 6.21 a 7.25 a F2 201.93 d 51.68 a 19.40 a 17.61 b 69.48 d 17.79 a 6.67 a 6.06 b F3 221.98 c 53.73 a 15.07 b 17.29 b 72.05 c 17.44 a 4.89 b 5.61 b F4 273.02 a 50.67 a 12.64 b 14.54 d 77.80 a 14.45 c 3.61 c 4.14 d F5 243.36 b 48.00 b 14.00 b 15.78 c 75.78 b 14.95 c 4.36 b 4.92 c 显著性检验 Significance test N ** * ** ** ** ** ** NS F ** ** ** ** ** ** ** ** N×F ** * ** ** ** * * ** 注：N1和N2分别表示施氮量为 192和240 kg/hm2；F1处理为普通尿素分两次施用，F2、F3、F4、F5处理为控释尿素和普通尿素混合一次性基施，其中控释肥氮素比例依次为30%、50%、70%、100%。同列数据后不同小写字母表示同一施氮量不同掺混比例处理间差异显著 (P<0.05)。*、**表示变量效应达到0.05、0.01显著水平，NS—效应不显著。
Note: N1 and N2 indicate N application rate of 192 and 240 kg/hm2; F1 indicates common urea as basal and topdressing fertilizer, F2, F3, F4, and F5 indicate complete basal application of controlled release and common urea with the controlled release urea N ratio of 30%, 50%, 70%, and 100%, respectively. Values followed by different lowercase letters in a column indicate significant difference among treatments with the same N application rate (P<0.05). *, and ** indicate the variable effect at 0.05, and 0.01 significant levels, and NS indicates no significant effect.

表 4 不同处理下冬小麦氮素的再分配

Table 4 Nitrogen relocation in winter wheat as affected by nitrogen fertilizer treatments

处理
Treatment 2020—2021 2021—2022 开花前 Pre-anthesis 开花后 Post-anthesis 开花前 Pre-anthesis 开花后 Post-anthesis 转运量
NRA
(kg/hm2) 转运效率
NRR
(%) 籽粒贡献率
NRCT
(%) 积累量
NAG
(kg/hm2) 贡献率
NACT
(%) 转运量
NRA
(kg/hm2) 转运效率
NRR
(%) 籽粒贡献率
NRCT (%) 积累量
NAG
(kg/hm2) 贡献率
NACT
(%) N1 F1 136 b 66.4 b 70.9 abc 55.9 a 29.1 a 154.8 bc 65.7 b 72.5 a 58.7 ab 27.5 a F2 127 c 65.8 b 70.2 bc 53.7 a 29.8 a 132.5 d 58.4 d 72.9 a 49.3 b 27.1 a F3 140 b 72.9 a 70.0 c 60.2 a 30.0 a 150.4 c 62.5 c 73.9 a 53.2 b 26.1 a F4 158 a 73.5 a 72.4 ab 60.4 a 27.6 a 175.7 a 69.3 a 73.5 a 63.3 a 26.5 a 　 F5 155 a 71.2 a 72.8 a 58.0 a 27.2 a 159.3 b 68.2 a 72.9 a 59.3 ab 27.1 a N2 F1 141 c 66.9 c 70.9 a 57.8 ab 29.1 a 162.4 c 63.6 d 74.2 a 56.6 b 25.8 a F2 134 c 66.6 c 71.0 a 54.8 b 29.0 a 148.3 d 62.6 d 73.5 a 53.6 b 26.5 a F3 151 b 72.4 b 71.9 a 59.1 ab 28.1 a 165.2 c 65.7 c 74.4 a 56.8 b 25.6 a F4 170 a 75.0 a 72.7 a 63.6 a 27.3 a 201.8 a 74.3 a 73.9 a 71.2 a 26.1 a 　 F5 168 a 74.8 a 72.0 a 65.3 a 28.0 a 180.9 b 69.9 b 74.4 a 62.4 ab 25.6 a 显著性检验 Significance test N ** ** NS NS NS ** ** * NS * F ** ** NS * NS ** ** NS * NS N×F NS * NS NS NS * ** NS NS NS 注：N1和N2分别表示施氮量为 192和240 kg/hm2；F1处理为普通尿素分两次施用，F2、F3、F4、F5处理为控释尿素和普通尿素混合一次性基施，其中控释肥氮素比例依次为30%、50%、70%、100%。同列数据后不同小写字母表示同一施氮量不同掺混比例处理间差异显著(P<0.05)。*、**表示变量效应达到0.05、0.01显著水平，NS—效应不显著。
Note: N1 and N2 indicate N application rate of 192 and 240 kg/hm2; F1 indicate common urea as basal and topdressing fertilizer, F2, F3, F4, and F5 indicate complete basal application of controlled release and common urea with the controlled release urea N ratio 30%, 50%, 70%, and 100% CRU, respectively. NRA—Nitrogen relocation amount in vegetative organs; NRR—Nitrogen relocation rate in vegetative organs; NRCT—Total contribution rate of pre-anthesis N relocation to grain N accumulation; NAG—Nitrogen uptake amount after anthesis; NACT—Contribution rate of post-anthesis N accumulation to the grain N. Values followed by different lowercase letters in a column indicate significant difference among treatments in the same N application rate (P<0.05). * and ** indicate the variable effect at 0.05, and 0.01 significant levels, and NS indicate no significant effect.

表 5 不同处理冬小麦产量及其构成因素

Table 5 Yield and its components of winter wheat under different treatments

处理
Treatment 　2020—2021　　2021—2022　穗数
Number of spikes
(×104/hm2) 穗粒数
Grains per
spike 千粒重
1000-grain
weight (g) 产量
Grain yield
(kg/hm2) 穗数
Number of spikes
(×104/hm2) 穗粒数
Grains per
spike 千粒重
1000-grain weight
(g) 产量
Grain yield
(kg/hm2) N1 F1 481 b 35.6 a 49.5 a 7795 b 553 bc 39.7 a 47.0 a 9006 b F2 469 b 36.9 a 48.8 a 7268 c 543 c 37.1 a 46.6 a 8514 c F3 475 b 36.6 a 49.4 a 7489 c 554 bc 39.1 a 46.5 a 9023 b F4 509 a 35.7 a 49.7 a 8514 a 600 a 39.8 a 47.1 a 9868 a 　 F5 514 a 37.1 a 49.1 a 8395 a 569 b 39.8 a 48.5 a 9272 b N2 F1 505 b 37.9 a 49.8 b 7965 b 559 c 39.2 a 47.4 a 9108 c F2 473 c 34.1 ab 49.1ab 7272 c 546 c 37.6 a 47.7 a 8585 d F3 481 c 34.5 ab 50.1 ab 7432 c 553 c 39.4 a 46.5 a 9156 c F4 536 a 34.8 ab 50.6 a 8771a 639 a 39.9 a 46.0 a 11382 a 　 F5 544 a 36.1 a 49.8 ab 8794 a 607 b 39.9 a 46.9 a 10052 b 显著性检验 Significance test N ** NS * * ** NS NS ** F ** NS NS ** ** NS NS ** N×F * NS NS NS ** NS NS ** 注：N1和N2分别表示施氮量为 192和240 kg/hm2；F1处理为普通尿素分两次施用，F2、F3、F4、F5处理为控释尿素和普通尿素混合一次性基施，其中控释肥氮素比例依次为30%、50%、70%、100%。同列数据后不同小写字母表示同一施氮量不同掺混比例处理间差异显著(P<0.05)。*、**表示变量效应达到0.05、0.01显著水平，NS—效应不显著。
Note: N1 and N2 indicate N application rate of 192 and 240 kg/hm2; F1 indicates common urea applied in base and topdressing, F2, F3, F4, and F5 indicate complete application of controlled release and common urea as base fertilizer, with the controlled release urea N ratio of 30%, 50%, 70%, and 100%, respectively. Values followed by different lowercase letters in a column indicate significant difference among treatments of the same nitrogen application rate (P<0.05). *, and ** indicate the variable effect at 0.05, and 0.01 significant levels, and NS indicate no significant effect.

表 6 不同处理下冬小麦产值和经济效益

Table 6 The output value and economic benefit of winter wheat under different treatments

处理
Treatment 　 2020—2021 　　　 2021—2022 　　产值
Output
(yuan/hm2) 肥料投入
Fertilizer cost
(yuan/hm2) 其他
Others
(yuan/hm2) 净效益
Benefit
(yuan/hm2) 产值
Output
(yuan/hm2) 肥料投入
Fertilizer cost
(yuan/hm2) 其他
Other
(yuan/hm2) 净效益
benefit
(yuan/hm2) N1 F1 17929.4 b 2053.3 3000 12876.1 b 21614.2 b 2541.2 3700 15373.0 bc F2 16716.8 c 2224.6 2500 11992.2 c 20434.4 c 2717.3 3000 14717.1 c F3 17225.1 c 2338.8 2500 12386.3 bc 21654.6 b 2834.7 3000 15819.9 b F4 19582.0 a 2453.0 2500 14629.0 a 23682.8 a 2952.0 3000 17730.8 a F5 19308.5 a 2624.4 2500 14184.2 a 22252.4 b 3128.1 3000 16124.3 b N2 F1 18319.6 b 2270.6 3000 13049.0 b 21858.3 c 2830.9 3700 15327.4 cd F2 16725.2 c 2484.7 2500 11740.5 c 20604.4 d 3051.0 3000 14553.4 d F3 17093.6 c 2627.5 2500 11966.1 c 21974.2 c 3197.7 3000 15776.5 c F4 20173.1 a 2770.2 2500 14902.8 a 27316.3 a 3344.4 3000 20972.0 a 　 F5 20225.2 a 2984.4 2500 14740.8 a 24124.0 b 3564.4 3000 17559.5 b 显著性检验 Significance test N * * ** ** F ** ** ** ** N×F NS NS ** ** 注：N1和N2分别表示施氮量为 192和240 kg/hm2；F1处理为普通尿素分两次施用，F2、F3、F4、F5处理为控释尿素和普通尿素混合一次性基施，其中控释肥氮素比例依次为30%、50%、70%、100%。同列数据后不同小写字母表示同一施氮量不同掺混比例处理间差异显著 (P<0.05)。*、**分别表示变量效应达到0.05、0.01显著水平，NS—效应不显著。
Note: N1 and N2 indicate N application rate of 192 and 240 kg/hm2; F1 indicate common urea as base and topdressing fertilizer, F2, F3, F4, and F5 indicate complete basal application of controlled release and common urea with the controlled release urea N ratio 30%, 50%, 70%, and 100% CRU, respectively. Values followed by different lowercase letters in a column indicate significant difference among treatments of the same nitrogen application rate (P<0.05). * and ** indicate the variable effect at 0.05, and 0.01 significant levels, and NS indicates no significant effect.

表 7 不同处理下冬小麦氮素利用效率

Table 7 Nitrogen use efficiency of winter wheat under different treatments

处理
Treatment 2020—2021 2021—2022 氮素利用效率
NUtE
(kg/kg) 氮素吸收效率
NUpE
(kg/kg) 氮肥偏生产力
PFPN
(kg/kg) 氮素利用效率
NUtE
(kg/kg) 氮素吸收效率
NUpE
(kg/kg) 氮肥偏生产力
PFPN
(kg/kg) N1 F1 29.81 b 1.36 b 40.60 b 30.60 b 1.53 b 46.91 b F2 29.50 b 1.28 c 37.86 c 30.81 b 1.44 c 44.35 c F3 29.62 b 1.32 bc 39.01 bc 30.70 b 1.53 b 46.99 b F4 30.84 a 1.44 a 44.34 a 31.16 ab 1.65 a 51.39 a 　 F5 30.48 a 1.43 a 43.72 a 31.65 a 1.53 b 48.29 b N2 F1 29.67 b 1.12 b 33.19 b 29.18 c 1.30 bc 37.95 c F2 28.35 c 1.07 c 30.30 c 29.54 c 1.21 d 35.77 d F3 27.73 d 1.12 b 30.97 c 29.72 c 1.28 c 38.15 c F4 30.28 a 1.21 a 36.55 a 32.44 a 1.46 a 47.42 a 　 F5 30.32 a 1.21 a 36.64 a 31.30 b 1.34 b 41.88 b 显著性校检验 Significance test N ** ** ** ** ** ** F ** ** ** ** ** ** N×F ** NS NS ** NS ** 注：N1和N2分别表示施氮量为 192和240 kg/hm2；F1处理为普通尿素分两次施用，F2、F3、F4、F5处理为控释尿素和普通尿素混合一次性基施，其中控释肥氮素比例依次为30%、50%、70%、100%。NUtE—氮素利用效率；NUpE—氮素吸收效率；PFPN—氮肥偏生产力。同列数据后不同小写字母表示同一施氮量不同掺混比例处理间差异显著 (P<0.05)。*、**分别表示变量效应达到0.05、0.01显著水平，NS—效应不显著。
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