Simulation of Grain Filling Rate of Winter Wheat Under Water and Nitrogen Stress

doi:10.11924/j.issn.1000-6850.casb18120113

Abstract

Abstract:

To quantitatively analyze the effects of water and nitrogen stress on winter wheat grain filling rate, we carried out field experiments in 2016-2017 and 2017-2018 growing seasons using winter wheat variety ‘Jimai 22’ under various water and nitrogen application levels. On the basis of experiment data collected in the 2017-2018 growing season, a simulation model of winter wheat grain filling rate under water and nitrogen stress was built by analyzing the influence rule of water and nitrogen stress on winter wheat grain filling rate, as well as introducing the water and nitrogen impact factors, and could be specifically described as: S_(j,t)=S_(W3N300,t)×(1+F_N)×(1+F_W). The model was then validated with an independent dataset collected in the 2016-2017 growing season. Except the ratio of mean absolute error (d_a) to the mean observation (d_ap), the root mean squared error (RMSE), mean absolute error (d_a), and correlation (r) all showed that the simulated values were well identical to the measured ones. The model can be used to simulate the effects of water and nitrogen stress on winter wheat growth and yield.

Key words: water and nitrogen stress, winter wheat, grain filling rate, simulation

CLC Number:

S512.1

Yuli Chen, Ping Yang, Fajiang Gong, Haibin Bi, Minghui Gao, Gui Qi, Huawei Li. Simulation of Grain Filling Rate of Winter Wheat Under Water and Nitrogen Stress[J]. Chinese Agricultural Science Bulletin, 2020, 36(10): 8-12.

Figures/Tables 5

References 28

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处理	相关系数	模型F值	W₀/g	A	B
W1N0	0.993^**	114.093^**	50.211^**	8.694^**	0.178^**
W1N120	0.999^**	711.389^**	52.094^**	7.686^**	0.164^**
W1N180	0.999^**	727.875^**	51.943^**	6.741^**	0.160^**
W1N240	0.999^**	1457.596^**	54.229^**	6.689^**	0.143^**
W1N300	0.999^**	1451.065^**	53.610^**	7.326^**	0.152^**
W3N0	0.998^**	465.063^**	62.436^**	7.408^**	0.110^**
W3N120	0.996^**	243.634^**	52.887^**	10.361^**	0.159^**
W3N180	0.994^**	151.571^**	53.473^**	7.593^**	0.147^**
W3N240	0.996^**	230.298^**	53.906^**	10.399^**	0.159^**
W3N300	0.996^**	223.204^**	53.856^**	7.893^**	0.139^**

处理	相关系数	模型F值	W₀/g	A	B
W1N0	0.993^**	114.093^**	50.211^**	8.694^**	0.178^**
W1N120	0.999^**	711.389^**	52.094^**	7.686^**	0.164^**
W1N180	0.999^**	727.875^**	51.943^**	6.741^**	0.160^**
W1N240	0.999^**	1457.596^**	54.229^**	6.689^**	0.143^**
W1N300	0.999^**	1451.065^**	53.610^**	7.326^**	0.152^**
W3N0	0.998^**	465.063^**	62.436^**	7.408^**	0.110^**
W3N120	0.996^**	243.634^**	52.887^**	10.361^**	0.159^**
W3N180	0.994^**	151.571^**	53.473^**	7.593^**	0.147^**
W3N240	0.996^**	230.298^**	53.906^**	10.399^**	0.159^**
W3N300	0.996^**	223.204^**	53.856^**	7.893^**	0.139^**