Effects of Fertilization on Forage Yield and Quality of Legume-Gramineae Mixtures in the Hexi Corridor Region
A field experiment was conducted in the Hexi Corridor oasis irrigated area to investigate the effects of fertilization on the yield and quality of Legume-Graminea mixtures.Five treatments were established:no fertilization(N0P0K0),balanced fertilization(N2P2K2),no nitrogen addition(N0P2K2),no phosphorus addition(N2P0K2),and no potassium addition(N2P2K0).The results showed that,compared to the control(N0P0K0),all four fertiliza-tion treatments significantly increased hay yield,forage nutritional quality parameters,and soil nutrient content.Addi-tionally,these treatments significantly decreased the contents of neutral detergent fiber and acid detergent fiber.Under the N2P2K2 treatment,the hay yield,crude protein,and relative feed value,soil organic matter,available nitrogen,available phosphorus,and available potassium were 110.55%,19.72%,12.61%,32.46%,42.58%,85.51%,31.25%higher,respectively,than those of N0P0K0 treatment in the first year.In the following year,these values were 61.17%,18.27%,10.37%,27.68%,33.28%,66.08%,32.00%higher,respectively,than those of the N0P0K0 treatment.Furthermore,the neutral detergent fiber and the acid detergent fiber contents were 6.26% and 6.37%lower in the first year,and 11.82%and 7.71%lower in the second year compared to the N0P0K0 treatment,respectively.Moreover,the N2P2K2 treatment consistently outperformed the three partial fertilization treatments in terms of hay yield,nutritional quality,and soil nutrient content.Grey relativity analysis revealed the following ranking for fertilizer treatments was N2P2K2>N2P2K0>N0P2K2>N2P0K2>N0P0K0.These findings suggest that phos-phorus is the minimum nutrient limiting factor for Legume-Graminea mixtures performance in the Hexi Corridor.
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