水稻吸钾规律与钾素平衡的研究

黑龙江省水稻生长的实体模型,对两种不同类型的水稻土钾素养分变化进行模拟试验．结果表明,水稻对钾素吸收呈“山峰”式积累曲线;钾素在作物库内积累分布：茎秆＞叶片＞籽实＞根系;土壤库中速效钾动态变化趋势,以抽穗期为界限,前期略高于后期;土壤库内钾素的输出大于输入,属亏损型管理,盈亏量与施肥量呈“单谷状”曲线分布;以图解法求出钾素平衡时的施钾量．同时提出补给土壤库中钾素含量的对策．

STUDIES ON K UPTAKE REGULARITY OF RICE PLANT AND K BALANCE

The experiments were conducted to simulate the changes in potassium content in two paddy soils.The results showed that the accumulation curves of K in rice plant was peak-like, and the concentration of K in rice plant parts was in the following order:stem>leaf>seed>root.The content of rapidly available K in soil reservoir was slightly higher before heading stage than after that.The output of K was more than input,and the balance-fertilizer application rate curves had the shape of "single valley".Application rate of K fertilizer needed to achieve K balance is explained through the diagrams, and the ways to make up K deficiency are presented.