水稻钾锌配合施用互作效应的研究（Ⅰ）

Study on interaction of K,Zn combined application on rice

１０县市２０个田间试验，三种土壤（灰潮土田、潮土田、黄棕壤性水稻土）平均，单施钾水稻增产６．７％～１２．４％，单施锌增产７．２％，钾锌配施增产１３．３％～１６．３％；每公顷用６２．２５ｋｇ钾配合３．３ｋｇ锌的增产效果与１２４．５ｋｇ钾相当。表明钾锌配施有较好的互作效应，尤以在灰潮土田上效果最好。棕红壤性水稻土盆栽试验表明，钾锌配施可增加水稻植株含钾量，钾肥利用率比单施钾提高４．４～１４．９个百分点；同时可提高土壤有效钾、锌含量。

field experiments were conducted in three soils(calcareous alluvial field ,alluvialfield and yellow-brown rice soil ) in 10 counties (cities).Rice yield was increased by 6.7%～12.4%by K application,7.2%by Zn application ,combined application of K and Zn in creased rice yield by13.3%～16.3%.K(62.25kg/hm2) combined with Zn(3.3kg/hm2)can get a similiar rice yieldwith application ofK(124.5kg/hm2). This result shown there was a positive interaction effect of Kand Zn on rice yield ,especially on calcareous alluvial field. Results on brown-red rice soil potexperiment shown that combined application of K and Zn can increase K content of rice plant ,theutillzation rate of K was increased by 4.4%～14.9% compared to single K application, soil availableK and Zn content were also increased.