锌肥对崇明水稻的增产效果研究

Study on the effect of zinc fertilizer on rice yield in Chongming County

依据第二次土壤普查资料和崇明地区稻田土壤缺锌的实地调查结果,开展了水稻直播追施锌肥试验和秧盘育秧适宜锌肥液浓度试验。4个不同点位3年试验结果表明:在氮磷钾肥料施用量充足的条件下,采用两种不同的锌肥施用方式均能改善水稻的农艺性状,促进有效分蘖,提高结实率,显著增加稻谷产量和经济效益。采用水稻直播追施锌肥的方式,最适宜的锌肥用量为30kg/hm^2;采用秧盘育秧,最适锌肥液浓度为2%。水稻直播追施锌肥的增产幅度(最高达19.17%)高于秧盘育秧添加锌肥液的增产幅度,但后者施锌肥方便。

According to the second general survey of soil and the survey result of zinc deficiency in paddy field soil in Chongming area,experiments of additional application of zinc fertilizer were carried out in direct-seed rice field and in raising seedlings in trays to study the effect of zinc fertilizer on the rice yield.The multiple location experiments for many years showed that under adequate application rates of N,P and K fertilizers,additional application of zinc fertilizer could improve the agronomic characters,effective tillering and seed-setting rate of rice,and significantly increase the rice yield and economic benefit.Under direct-seed rice field,the optimal application rate of zinc fertilizer was 30 kg/hm^2;and under raising seedlings in trays,the optimal concentration of zinc fertilizer solution was 2%.The rice yield increment produced by additional application of zinc fertilizer to direct-seed rice field could reach up to 19.17%and was higher than that by additional application of zinc fertilizer solution in raising seedlings in trays,but the latter was easier in operation.