一、前言 首先应该说明早稻叶片出现黄色的现象和原因是多种多样的。有的只有新叶或第一片叶先发黄,引起这种发黄的原因,常是由于水稻植株基部被三化螟所咬,出现枯心苗。有的是由于过量喷撒六六六农药所致,不管新叶或老叶,凡接触过多药粉的部分呈不规则的发黄。还有的是拔秧时由于稻根受伤,插秧初期暂时既难从地下部分吸收养料,也缺乏从老叶转运养料的能力,这时嫩叶和老叶不能维持生活,都可相继变桔黄而死。还有的是施用秧根肥过 First, the preface should first of all explain the phenomenon of early rice leaves yellow and the reasons are varied. Some only the first leaf or the first leaf yellow, causing this yellow causes, often due to the base of the rice plants bored by three borers, there is dry seedlings. Some are due to excessive spraying of 666 pesticides caused, regardless of new leaves or old leaves, where exposure to excessive powder irregular yellowing. There is also when pulling rice seedlings root injury, early transplanting temporary difficult to absorb nutrients from the underground part, also lack the ability to transport nutrients from the old leaves, when young leaves and old leaves can not be maintained, can have become orange and die . There is the use of seedling fertilizer over