浅埋滴灌下种植密度与灌溉定额对玉米物质生产的影响OA

To investigate the effects of planting density and irrigation quotas on maize material production under shallow buried drip irrigation,a field positioning experiment with split-plot design was employed.Planting density was the primary treatment,with three levels set at 75 000 plants/hm2(D1),90 000 plants/hm2(D2),and 105 000 plants/hm2(D3);Irrigation quotas served as secondary treatments,with three levels:1 800 m³/hm2(W1),2 250 m³/hm2(W2),and 2 700 m³/hm2(W3).The results showed that leaf area index,total dry matter accumulation,transport volume,and trans-port rate increased with rising planting density and irrigation quota.Total dry matter accumulation during the silking pe-riods D1 and D3 showed that W3 was 6.18%and 9.87%higher than W1(P＜0.05),respectively,with significant dif-ferences observed.At the maturity period,W3 was significantly higher than W1(P＜0.05)across different planting densities.Under treatment D2,the total dry matter transport at W3 was significantly higher than at W1(P＜0.05);un-der treatment D3,W3 was significantly higher than both W1 and W2(P＜0.05).The leaf dry matter transport rate un-der treatment D2 was significantly higher at W3 than at W1(P＜0.05).Increasing planting density enhanced maize grain yield and irrigation water use efficiency.Under treatment D1 and D3,grain yields for W2 and W3 were signifi-cantly higher than those for W1(P＜0.05);Under treatment D2,W3 was significantly higher than W1(P＜0.05),but there was no significant difference compared to W2.Irrigation water use efficiency among irrigation quotas exhibited a significant difference,with W1＞W2＞W3(P＜0.05).The combination of 105 000 plants/hm2 and 2 250 m³/hm2 ir-rigation quota could achieve high grain yields and efficient irrigation water use,making it a suitable management prac-tice for high-yield,high-efficiency maize cultivation on the Xiliaohe Plain.