Effect of nitrogen and phosphorus combined application on forage yield of Elymus sibiricus in an alpine region

doi:10.11686/cyxb2023459

Abstract

Abstract:

This research investigated the effects of different application rates of nitrogen and phosphorus fertilizer on forage yield of Elymus sibiricus cv. Qingmu No. 2 in an alpine region. Four nitrogen fertilizer rates （0， 60， 90， 120 kg N·ha^-1） and four phosphate fertilizer rates （0， 30， 60， 90 kg P·ha^-1） levels were included in the experiment to identify the effect of the various N and P fertilizer combinations on E. sibiricus growth traits， forage yield and economic return. Structural equation modelling was used to assess the pathways by which effects of the different N and P combinations influenced the forage yield of E. sibiricus. This research provides data to underpin extension advice to farmers on how to achieve efficient production of high-quality forage in alpine regions. It was found： 1） Plant height， stem diameter， tiller numbers， fertile tiller numbers， forage yield and economic return of E. sibiricus were significantly increased by combined N and P application， and those traits showed a pattern of initial increase and then decrease with increase in P application at the same N application level. 2） The forage yield and net income were the highest （12154.14 kg·ha^-1 and 3370.49 CNY·ha^-1 respectively）， in the treatment with a combined application of 60 kg N·ha^-1 and 60 kg P·ha^-1. 3） The structural equation model showed that tillering is the primary driving factor for improving the forage yield of E. sibiricus under combined application of N and P fertilizer. 4） Integrated evaluation of traits using a TOPSIS model showed that the combined application of 60 kg N·ha^-1 and 60 kg P·ha^-1 not only maintained higher forage yield， but also significantly improved economic returns， compared to other treatments. This N and P combination is therefore recommended as suitable management practice for forage production of E. sibiricus in alpine regions.

Key words: Elymus sibiricus, nitrogen and phosphorus combined application, forage yield, economic benefits

Qi-lin LIU, Xiao-jun WANG, Jin-lan WANG, Wen-hui LIU, Qiao-ling MA, Jian-hui LI, Sheng-yuan ZHANG, Wen-xia CAO, Wen LI. Effect of nitrogen and phosphorus combined application on forage yield of Elymus sibiricus in an alpine region[J]. Acta Prataculturae Sinica, 2025, 34(6): 193-202.

Figures/Tables 6

References 39

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项目 Item	处理 Treatment	平方和 Square sum	自由度 Degree of freedom	均方 Mean square	F	P
株高 Plant height	氮N	2562.69	3	854.23	28.89	0.000
	磷P	1698.03	3	566.01	19.14	0.000
	氮×磷N×P	1150.11	9	127.79	4.32	0.000
茎粗 Stem diameter	氮N	0.22	3	0.07	2.12	0.103
	磷P	0.57	3	0.19	5.55	0.002
	氮×磷N×P	0.46	9	0.05	1.49	0.162
分蘖数 Tillers	氮N	189114.83	3	63038.28	16.78	0.000
	磷P	212420.99	3	70807.00	18.85	0.000
	氮×磷N×P	33062.33	9	3673.59	0.98	0.487
生殖枝数 Fertile tillers	氮N	160463.84	3	53487.95	12.72	0.000
	磷P	316125.07	3	105375.02	25.06	0.000
	氮×磷N×P	56836.60	9	6315.18	1.50	0.214
干鲜比 Dry-fresh ratio	氮N	0.010	3	0.003	2.547	0.085
	磷P	0.002	3	0.001	0.704	0.561
	氮×磷N×P	0.020	9	0.002	1.702	0.154
茎叶比 Stem-leaf ratio	氮N	0.207	3	0.069	6.152	0.004
	磷P	0.105	3	0.035	3.129	0.049
	氮×磷N×P	0.138	9	0.015	1.361	0.269
饲草产量 Forage yield	氮N	16856498.0	3	5618833.0	27.241	0.000
	磷P	4639826.0	3	1546609.0	7.498	0.001
	氮×磷N×P	5980822.0	9	664535.7	3.222	0.014

项目 Item	处理 Treatment	平方和 Square sum	自由度 Degree of freedom	均方 Mean square	F	P
株高 Plant height	氮N	2562.69	3	854.23	28.89	0.000
	磷P	1698.03	3	566.01	19.14	0.000
	氮×磷N×P	1150.11	9	127.79	4.32	0.000
茎粗 Stem diameter	氮N	0.22	3	0.07	2.12	0.103
	磷P	0.57	3	0.19	5.55	0.002
	氮×磷N×P	0.46	9	0.05	1.49	0.162
分蘖数 Tillers	氮N	189114.83	3	63038.28	16.78	0.000
	磷P	212420.99	3	70807.00	18.85	0.000
	氮×磷N×P	33062.33	9	3673.59	0.98	0.487
生殖枝数 Fertile tillers	氮N	160463.84	3	53487.95	12.72	0.000
	磷P	316125.07	3	105375.02	25.06	0.000
	氮×磷N×P	56836.60	9	6315.18	1.50	0.214
干鲜比 Dry-fresh ratio	氮N	0.010	3	0.003	2.547	0.085
	磷P	0.002	3	0.001	0.704	0.561
	氮×磷N×P	0.020	9	0.002	1.702	0.154
茎叶比 Stem-leaf ratio	氮N	0.207	3	0.069	6.152	0.004
	磷P	0.105	3	0.035	3.129	0.049
	氮×磷N×P	0.138	9	0.015	1.361	0.269
饲草产量 Forage yield	氮N	16856498.0	3	5618833.0	27.241	0.000
	磷P	4639826.0	3	1546609.0	7.498	0.001
	氮×磷N×P	5980822.0	9	664535.7	3.222	0.014

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