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土壤管理上免耕法有什么优缺点?

问答题
2022-04-19 10:44
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正确答案

不耕作或极少耕作,用化学除草剂除草。免耕法在果园、菜地、花圃都可施用。
其优点是:
a无坚硬的犁底层,保持土壤自然结构;b作物间通风透光;c可结合地面喷灌来喷施除草剂,利于机械化管理,省时省工。
但其缺点是:
a长期免耕,土壤有机质含量下降快,增加了对人工施肥的依赖;
b受除草剂种类、浓度等限制,易形成除草剂胁迫现象。
因此,近些年在发达国家,主张采用半杀性除草,即只控制杂草的有害时期或过旺的生长,保持杂草的一定产草量,以增加土壤有机质含量,又称改良免耕法。改良免耕法在我国的果园和成年木本花圃的土壤管理中更为适用


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