额外多施肥和购买新的机器才有帮助。
Spreading extra fertiliser or buying new machinery helps.
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而且这些地方浇水和施肥都很困难，相应的也就增加了额外的养护费用。
They also are more difficult to water and fertilize, adding further to the cost of maintenance.
额外的要害词：不施肥处理、氧化应激。
Additional key words: Oryza sativa, oxidative stress.
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