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土壤管理上清耕法有什么优缺点?

问答题
2022-04-19 10:44
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正确答案

在生长季内多次浅清耕,松土除草,一般灌溉后或杂草长到一定高度即中耕。此法在果园、菜地、花圃均可应用。
其优点是
a经常中耕除草,作物通气好;
b采收产品较干净,如叶菜类的蔬菜等;
c春季土壤温度上升较间通气好;春季土壤温度上升快,有利于育苗。
但其缺点是:
a土肥水流失严重,尤其是在有坡度的种植园;
b长期清耕,土壤有机质含量降低快,增加了对人工施肥的依赖;
c犁底层坚硬,不利于土壤透气、透水,影响作物根系生长;
d无草的种植园生态条件不好,作物害虫的天敌少了;
e劳动强度大,费时费工。因此,在实施清耕法时应尽量减少次数,或者在长期施用免耕法、生草法后进行短期性清耕。总之,清耕法弊病很多,不应再提倡使用


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