X. Wang, X. Zhang, L. Liu, G. Feng, X. Liu, J. Wang, C. Wei
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引用次数: 0
Abstract
. Rice drip irrigation cultivation is an efficient water-saving cultivation technique. However, it is a special water environment for rice, which makes rice vulnerable to water shortage during the whole growth period or at a certain stage. In this study, five water treatments were set up: drip irrigation regimes (DI), water deficient irrigation for 15 days at panicle differentiation stage (T1), booting stage (T2), flowering stage (T3) and grain filling stage (T4). Results indicated that the T1 treatment reduced the yield most, about 30.6% lower than that in DI treatment. T1 treatment significantly decreased the number of secondary branches and grains per panicle. The T2 and T3 treatment reduced the seed-setting rate of rice and led to yield reduction. The grain weight of grains on bottom secondary branches in T4 treatment was significantly decreased. Overall, In the drip irrigation management, further water shortage at different growth stages will lead to a reduction of yield. Therefore, in production practice, it is necessary to ensure adequate irrigation (soil water content kept 90% of the field water capacity at least) from the beginning of reproductive growth, especially in panicle differentiation stage. This provides a direction for breeding and water management under drip irrigation.
。水稻滴灌栽培是一种高效的节水栽培技术。然而,这对水稻来说是一个特殊的水环境,使得水稻在整个生育期或某一阶段都容易缺水。本试验设置了滴灌、穗分化期(T1)、孕穗期(T2)、开花期(T3)和灌浆期(T4)亏水灌溉15 d 5种水分处理。结果表明,T1处理的产量降幅最大,比DI处理降低了30.6%。T1处理显著降低了次枝数和每穗粒数。T2和T3处理降低了水稻的结实率,导致产量降低。T4处理下次枝籽粒重显著降低。总体而言,在滴灌管理中,不同生长阶段进一步缺水将导致产量下降。因此,在生产实践中,从生殖生长开始,特别是在穗分化阶段,必须保证充足的灌溉(土壤含水量至少保持田间水量的90%)。这为滴灌育种和水管理提供了方向。
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