分蘖期土壤水分对旱稻矿质养分吸收的影响

在池栽条件下研究了不同水分处理对旱稻吸收氮磷钾及分蘖生产效率的影响。结果表明:土壤水分对旱稻吸收N、P、K矿质元素有明显影响。随着土壤水分含量的提高,植株对矿质元素的吸收量显著提高。在分蘖初期,65%水分处理的植株对N、P、K的吸收量分别只有100%的74.1%,43.9%和50.8%,而在分蘖后期,则分别只有100%的41.4%,18.6%和27.5%。旱稻矿质元素的分蘖生产效率以在85%土壤含水量时最高,其N、P、K的平均分蘖生产效率分别比100%高35.7%,140%和81.8%。平均分蘖生产效率表现为P>K>N。

Effects of Soil Moisture on Mineral Nutrition Uptake in Upland Rice at Tillering Stage

The characters of mineral nutrition uptake and efficiency of tiller production in upland rice were studied with pond culture experiment.The results indicated that: the soil moisture remarkably influenced N,P,K nutrition uptake.With the improvement of the content of soil moisture,the mineral nutrition uptake amount improves notably.During the early tillering stage,the nutrition absorption amount of N,P and K at 65% soil moisture were 74.1%,43.9% and 50.8% of 100% soil moisture respectively,and at later tillering stage,the N,P and K absorption amount of 65% were 41.4%,18.6% and 27.5% of 100%.The maximum efficiency of tiller production with mineral nutrition was 85% of soil moisture,the mineral nutrition of N,P and K tillering productive efficiency of 85% were 35.7%,140% and 81.8% more than 100%,respectively.The mean tillering productive efficiency were P>K>N.