氮磷配施下夏玉米临界氮浓度稀释曲线的构建与氮营养诊断

doi:10.3864/j.issn.0578-1752.2022.05.008

Abstract

Abstract:

【Objective】This study investigated the effects of different nitrogen and phosphorus application rates on summer maize aboveground biomass, nitrogen accumulation, and drew a critical nitrogen concentration dilution curve. The nitrogen status of maize plant was diagnosed and evaluated based on a model of nitrogen nutrition index (NNI) under different nitrogen and phosphorus interaction conditions, which provided a theoretical basis for the rational application of nitrogen and phosphorus fertilizers in summer maize.【Method】By using Zhengdan958 (ZD958) and Yuyu22 (YY22) as tested materials, the field experiments in Guanzhong Plain, Shaanxi included four phosphorus application rates and five nitrogen application rates, such as 0 (P0), 60 (P1), 120 (P2), 180 (P3) kg P₂O₅·hm^-2and 0 (N0), 75 (N1), 150 (N2), 225 (N3), 300 (N4) kg N·hm^-2during 2019-2020. The aboveground samples were taken during the jointing, tasseling, filling, and maturity stages of summer maize to analyze the effects of nitrogen and phosphorus application rate on maize dry matter accumulation, dynamic changes of nitrogen concentration and grain yield. The field test data was used to construct and verify the critical nitrogen dilution curve model of summer maize.【Result】The results showed that nitrogen and phosphorus application rate significantly increased aboveground biomass, plant nitrogen concentrations and grain yield of summer maize. The grain yield and aboveground biomass of summer maize increased as the nitrogen application rate increased within the same phosphorus application condition. The nitrogen concentration of maize plants showed a decreasing trend with the extension of growth period and the increase of aboveground dry matter weight. There was a power exponential relationship between nitrogen concentration and aboveground biomass. In addition, the phosphorus application could promote maize plant nitrogen absorption and aboveground dry matter accumulation. The overall performance of the phosphorus application treatments was P2>P3≈P1>P0 under the same nitrogen application conditions, appropriate phosphorus application could improve the capacity of maize plant for nitrogen absorption and relieved the decline of nitrogen concentration. The critical nitrogen concentration (N_c) curves of maize (P0, N_c=27.98DM^-0.249; P1, N_c=29.77DM ^-0.182; P2, N_c= 30.81DM ^-0.138; P3, N_c=30.06DM ^-0.187) were constructed according to the aboveground dry matter (DM) weight and its nitrogen concentration under different phosphorus application conditions; the relatively stable model had a linear correlation between the fitted and actual plant nitrogen concentrations, which showed that the n-RMSE were 10.23%, 6.67%, 6.95% and 7.19%, respectively. The NNI values were calculated based on the critical nitrogen concentration curves. NNI increased with the increase of nitrogen application in each growth stages within the same phosphorus application conditions, which was also positively correlated with relative aboveground biomass (RDW) and relative yield (RY). 【Conclusion】Based on the model of nitrogen nutrition(NNI) in this study, N2-N3 and P1-P2 were the best conditions. Based on the fitting curve of comprehensive nitrogen application rate and grain yield, the nitrogen rate of 187.5-205.7 kg·hm^-2and phosphorus rate of 60-120 kg·hm^-2was the optimal fertilization option for summer maize in Guanzhong Plain, Shaanxi.

Key words: summer maize, nitrogen and phosphorus application rate, critical nitrogen dilution curve, nitrogen nutrition index

LIU Miao,LIU PengZhao,SHI ZuJiao,WANG XiaoLi,WANG Rui,LI Jun. Critical Nitrogen Dilution Curve and Nitrogen Nutrition Diagnosis of Summer Maize Under Different Nitrogen and Phosphorus Application Rates[J].Scientia Agricultura Sinica, 2022, 55(5): 932-947.

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年份 Year	施氮水平 Nitrogen rate	有机质 OM (g·kg^-1)	全氮 Total N (g·kg^-1)	全磷 Total P (g·kg^-1)	全钾 Total K (g·kg^-1)	速效磷 Available P (mg·kg^-1)	速效钾 Available K (mg·kg^-1)	硝态氮 Nitrate N (mg·kg^-1)	铵态氮 Ammonium N (mg·kg^-1)
2019	N0	18.45	0.92	0.95	10.21	15.12	122.64	3.92	3.11
	N1	19.29	0.98	0.93	10.27	14.62	137.33	7.27	3.56
	N2	19.02	1.04	0.94	10.26	13.31	128.93	8.29	3.80
	N3	19.03	1.09	0.91	10.04	12.73	134.01	9.96	4.72
	N4	19.56	1.09	0.98	10.28	11.36	130.26	10.63	4.16
2020	N0	18.08	0.95	0.92	10.04	12.98	163.51	3.86	2.59
	N1	19.14	0.98	0.97	10.14	10.76	178.96	13.94	3.44
	N2	19.19	1.07	1.01	9.89	11.15	162.25	14.73	4.01
	N3	18.76	1.05	0.97	9.96	13.33	157.29	15.63	4.91
	N4	19.23	1.02	0.96	9.65	12.57	152.86	16.98	4.68

年份 Year	因子 Factor	V6		VT		R2		R6		产量 Yield
年份 Year	因子 Factor	DM	N_a	DM	N_a	DM	N_a	DM	N_a	产量 Yield
2019	V	1.36^NS	0.14^NS	7.62*	3.61*	1.79^NS	2.72^NS	4.42^NS	4.19^NS	4.64^NS
	P	113.9***	146.1***	110.9***	389.9***	9.84***	308.3***	4.14*	490.8***	32.12***
	N	103.2***	145.9***	811.2***	692.8***	105.8***	744.5***	169.4***	131.9***	679.2***
	V×P	2.48^NS	4.95^NS	1.25^NS	5.89^NS	5.69*	3.65^NS	1.09^NS	6.98*	1.19^NS
	V×N	8.44*	1.15^NS	1.12^NS	3.75*	5.56^NS	1.42^NS	1.24^NS	2.42^NS	0.19^NS
	P×N	5.06***	7.02***	4.98***	5.36***	17.09***	6.87***	2.64*	13.29***	2.61**
	V×P×N	3.29*	2.59^NS	2.20*	1.42*	1.21^NS	2.21^NS	1.69^NS	3.45*	0.26^NS
2020	V	1.87^NS	4.12^NS	3.17^NS	0.54^NS	7.44*	1.79^NS	3.77^NS	1.84^NS	0.83^NS
	P	48.19***	843.2***	31.15***	770.4***	194.2***	626.6***	92.42***	559.7***	22.07***
	N	525.4***	127.1***	355.1***	146.4***	140.1***	109.4***	136.6***	128.6***	756.9***
	V×P	3.99*	5.03*	0.36^NS	3.22^NS	3.74^NS	2.42^NS	1.43^NS	2.23^NS	0.74^NS
	V×N	2.86^NS	2.00^NS	3.47*	4.04*	7.11*	3.07^NS	0.54^NS	3.65^NS	0.03^NS
	P×N	5.27***	2.82^NS	5.98***	2.18^NS	19.08***	1.55^NS	9.21***	1.06^NS	3.98***
	V×P×N	2.69*	1.47^NS	1.42^NS	1.84^NS	5.73*	1.66^NS	2.63^NS	2.16^NS	0.55^NS

年份 Year	施磷水平 Phosphorus rate	拟合方程 Regression equation	R²	最高产量 Maximum yield (kg·hm^-2)	最高产量施氮量 Optimum nitrogen rate (kg·hm^-2)	经济最佳施氮量 Optimum economic nitrogen rate (kg·hm^-2)
2019	P0	y=-0.063x²+28.53x+4573.22	0.898*	7790.00	225.54	215.65
	P1	y=-0.079x²+33.44x+4824.29	0.975*	8385.22	212.97	205.01
	P2	y=-0.077x²+33.63x+4916.68	0.987**	8572.61	217.43	209.35
	P3	y=-0.070x²+30.43x+4980.28	0.922*	8288.92	217.45	208.52
2020	P0	y=-0.074x²+34.22x+5886.84	0.886*	9853.29	231.82	223.35
	P1	y=-0.078x²+33.64x+6463.53	0.946*	10086.82	215.40	207.40
	P2	y=-0.078x²+32.58x+6752.42	0.988**	10155.48	208.93	200.91
	P3	y=-0.076x²+32.12x+6762.87	0.851*	10144.10	210.51	202.32

生育时期 Growth stage	P0		P1		P2		P3
生育时期 Growth stage	实测值Observed value	模拟值Simulated value	实测值Observed value	模拟值Simulated value	实测值Observed value	模拟值Simulated value	实测值Observed value	模拟值Simulated value
拔节期 V6	25.36	25.65	26.38	27.78	27.09	29.54	26.39	28.05
拔节期 V6	23.53	26.09	26.08	27.86	27.91	28.84	26.79	27.61
抽雄期 VT	18.66	17.62	21.33	21.19	24.41	23.42	22.88	20.76
抽雄期 VT	20.29	17.69	23.51	21.20	25.23	23.42	22.91	20.88
灌浆期 R2	16.25	14.77	18.45	18.41	22.05	21.04	19.04	18.02
灌浆期 R2	17.99	14.46	20.63	18.33	21.92	21.07	20.25	18.07
成熟期 R6	14.01	13.72	16.85	17.49	18.67	20.38	17.99	17.10
成熟期 R6	14.39	13.74	17.78	17.54	18.25	20.48	18.35	17.32
RMSE	1.925		1.426		1.611		1.570
n-RMSE	10.23%		6.67%		6.95%		7.19%

Critical Nitrogen Dilution Curve and Nitrogen Nutrition Diagnosis of Summer Maize Under Different Nitrogen and Phosphorus Application Rates

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