土壤底墒与苗期灌溉量对玉米出苗和苗期生长发育的影响

采用二次回归正交设计方法,进行了土壤底墒和苗期灌溉量对玉米出苗和苗期生长发育影响的盆栽试验研究,分别建立了苗期株高、总干重与土壤底墒、灌溉量关系回归模型。研究结果表明,土壤底墒显著影响玉米出苗率,玉米出苗率最高时的壤土和沙土底墒分别为20.6%和13.6%;土壤底墒和苗期灌溉量的交互作用对株高和单株干物质重量具有相互协同效应和替代效应;玉米苗期株高和总干重最大时的壤土底墒均为15.1%,最佳灌溉量分别为86.7 mm和91.7 mm;玉米苗期株高和总干重最大时的沙土底墒分别为12%和13%,最佳灌溉量均为76 mm。

Effect of soil moisture content in sowing and irrigation quota on maize emergence and growth in seedling period

To seek for the effects of soil moisture content in sowing and irrigation quota on maize emergence and growth in seedling period,a series of pot experiments was conducted with the orthogonal regression design.The regression equations were established to describe the relationships between both plant height and total dry matter weight of maize and both soil moisture content in sowing and irrigation quota.The results showed that the emergence rates of maize were markedly affected by soil moisture content in sowing.The highest emergence rate of maize was achieved when the soil moisture contents in sowing were 20.6% on loam soil and 13.6% on sandy soil.The interaction between soil moisture in sowing and irrigation quota presented the acceleration and substitution effects in plant height and total dry matter weight.On loam soil,the soil moisture content in sowing for the highest plant height and dry matter weight was all 15.1%,and the optimal irrigation quota for those were 86.7 mm and 91.7 mm respectively;On sandy soil,the soil moisture content in sowing for the highest plant height and dry matter weight was all 12.0% and 13.0% respectively,and the optimal irrigation quota for those were all 76 mm.