Effects of coupling water and different mulching materials on yield and nutrient components of silage maize
The purpose of this study was to investigate the coupling effects of water and different mulching materials on the yield and nutrient components of silage corn.'Long qingzhu No.1'maize was selected as experimental material.Two water gradients of full water irrigation(W1:75％～95％of soil relative water content)and water stress(W2:35％～55％of soil relative water content)were set,and four different plastic film mulching treatments,such as white plastic film(M1),black ground cloth(M2),biodegradable plastic film(M3)and liquid plastic film(M4),were selected.Eight treatments were set up,and full irrigation white plastic film mulching(W1M1)was used as control.The biological yield and nutrient content were measured at heading stage,filling stage and maturity stage respectively.The results showed that there was no significant difference in hay yield of silage maize at heading stage(initial stage of water stress)among different groups(P＞0.05).Under water stress(W2M1,W2M2,W2M3,and W2M4),the yield of hay at maturity was significantly lower than that of W1M1(P＜0.05).The fresh grass yield of W2M4 at heading stage was significantly lower than that of full irrigation group(W1M1,W1M2,W1M3,and W1M4)(P＜0.05).The fresh grass yields of water stress treatments(W2M1,W2M2,W2M3,and W2M4)was significantly lower than those of W1M1,W1M2,and W1M3(P＜0.05).At heading stage,the content of crude protein(CP)of maize treated with W2M1 and W2M3 was significantly lower than that of W1M1(P＜0.05),and the content of neutral detergent fiber(NDF)of W2M2,W2M3,and W2M4 was significantly higher than that of W1M1(P＜0.05).The relative feeding value(RFV)of W2M1,W2M2,and W2M3 was significantly lower than that of W1M1 at grain filling stage(P＜0.05).At the mature stage,the content of crude fat(EE)in W1M4 and W2M4 was significantly lower than those in other treatments(P＜0.05),and the content of NDF in W1M2,W1W3,and W1M4 was lower than those in W2M1 and W2M2(P＜0.05).Fresh grass yield was positively correlated with ADF and RFV(P＜0.05)and negatively correlated with NDF(P＜0.05).The study indicates that water stress and liquid plastic film mulching are not conducive to the improvement of silage corn yield and nutrient components compared with full irrigation and white plastic film mulching.
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