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关于我省农田物质循环状况、农田养分投入与产出以及循环效率等情况,目前省内虽有一些报道,但尚不够完整、系统。为此,我们根据建国以来36年(1950～1985)的农作物产量和投入物质的系统资料,计算出农田土壤主要营养元素氮磷钾的收支状况,并加以归纳和分析比较,试图从宏观上概括说明我省农田物质循环状况、农田养分平衡及其产投效益,为今后更好地调控农田养分,维持和提高地力,建立高产、优质、低耗的农田生态系统中的培肥、施肥制度,提供科学依据。
About the situation of the material circulation of farmland in our province, the input and output of farmland nutrients and the recycling efficiency, although there are some reports in the province at present, they are not yet complete and systematic. Therefore, based on the data of crop production and input materials of 36 years (1950 ~ 1985) since the founding of the People’s Republic of China, we calculated the income and expenses of NPK, which are the main nutrition elements of farmland soils, and summed up and analyzed them. It summarizes the situation of the material circulation of farmland in our province, the balance of farmland nutrient and the benefit of production and investment, and better controls the nutrient of farmland in the future, maintains and enhances the fertility, and establishes fertilizing and fertilizing system in high yield, high quality and low consumption agroecosystem , To provide a scientific basis.