(1)土壤有機質長期處於淹水狀態,分解不徹底,硫化氫、甲烷等還原性產物多,影響根係生長發育。
(2)土壤速效養分不足,特別是磷素缺乏,土溫偏低,磷的吸收受阻,常常使秧苗因缺磷而發生僵苗。
(3)微量元素缺乏,特別是有效鋅缺乏,也會引起僵苗現象。為防治水稻僵苗,應采取綜合防治措施:開(kai)溝(gou)排(pai)水(shui),降(jiang)低(di)地(di)下(xia)水(shui)位(wei),增(zeng)加(jia)土(tu)壤(rang)通(tong)透(tou)性(xing),增(zeng)加(jia)土(tu)壤(rang)氧(yang)化(hua)性(xing)能(neng),提(ti)高(gao)土(tu)壤(rang)的(de)保(bao)肥(fei)能(neng)力(li),使(shi)還(hai)原(yuan)性(xing)有(you)害(hai)物(wu)質(zhi)減(jian)少(shao),利(li)於(yu)發(fa)根(gen)。此(ci)外(wai),采(cai)取(qu)烤(kao)田(tian)、shaitianbanfa,tigaodiwen,cujindanlindeshifanghexishou,duihuanjiejiangmiaoyiyouli。shifeifangmian,yaoshiyongfushuhaodenongjiafei,zuowuzhenggeshengyuqizhuyidanfeigongying,fangzhizuowuchuxianzaoshuaixianxiang。chayangshishizusuxiaolinfei,keyijianshaoyinlinquefayinqidejiangmiao。zaiquexinyinqijiangmiaodeturangshang,zhuyixinfeideshiyong。linfeiyuxinfeiyoujiekangzuoyong,jihuxiangjiangdifeixiao,dandanyuxinzhibixiaoyu30使不會發生拮抗作用。總之,水稻僵苗現象是多種原因造成的,必須采取綜合防治措施,才能收到顯著效果。
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