Soil total P decreased linearly with time for gray desert soil, paddy soil and fluvo-aquic soil, but did not change significantly for other soils.
英
美
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在試驗進(jìn)行5年左右,土壤全磷含量都有所降低,以后各點(diǎn)表現不盡相同,新疆灰漠土、長(cháng)沙水稻土和鄭州潮土全磷含量隨時(shí)間延長(cháng)呈顯著(zhù)直線(xiàn)下降,其它試驗點(diǎn)全磷的變化不明顯;
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