Ecological fertilization method based on nitrogen-saving high paddy rice yield and non-point source emission reduction

Abstract

The invention discloses an ecological fertilization method based on nitrogen-saving high paddy rice yield and non-point source emission reduction, which includes the following steps: (1) determining target paddy rice yield Y(kg hm-2); (2) acquiring the potential nitrogen nutrient supply capability INS(kg hm-2) of soil: an N fertilizer-lacking fertilization area and a conventional fertilization area are established in advance; and the accumulated amount of the nitrogen of the overground part of paddy rice of the N fertilizer-lacking fertilization area is equal to INS; (3) measuring and calculating the amount RNR(kg hm-2) of demanded N nutrient under the target paddy rice yield: RNR is equal to Y multiplied by CGN plus (TB minus Y) multiplied by MCNS; (4) estimating the amount (FR, kg hm-2) of nitrogen fertilizer to be applied: FR is equal to (RNR minus INS) divided by (REN multiplied by NC); (5) dynamically regulating the amount of applied nitrogen fertilizer. Compared with the conventional fertilization management mode of farmers, the ecological fertilization mode based on the nitrogen-saving high yield and the non-point source emission reduction has the characteristics of accurate quantification, convenience in operation, low cost, high popularization and application value and the like.

Description

technical field [0001] The invention relates to the optimal fertilization management of nitrogen fertilizer in rice production, specifically an ecological fertilization method based on rice nitrogen-saving high-yield and non-point source emission reduction, belonging to the field of agricultural non-point source pollution control and environmental protection. Background technique [0002] my country is the country with the largest consumption of chemical fertilizer nitrogen in the world, and its nitrogen fertilizer consumption accounts for 30% of the world's total nitrogen fertilizer consumption, while rice nitrogen fertilizer consumption accounts for 37% of the world's total rice nitrogen fertilizer consumption. At present, excessive nitrogen application and unbalanced fertilization are common in rice production in my country. Excessive input of nitrogen fertilizer and unreasonable application have resulted in low utilization rate of nitrogen fertilizer, resulting in a large...

AI Technical Summary

Problems solved by technology

Conventional fertilization is mainly based on the farming experience of farmers. Due to regional differences, conventional fertilization has many forms such as light-medium-heavy-replenishment method, stable-attack-middle method, pre-promoted fertilization method, and pre-promoted-middle control-replenishment method. , these fertilization methods have played an important role in increasing rice production, but empirical fertilization blindly pursues high yield and fertilizer application is disorderly, and large water and large fertilizers also lead to serious non-point source pollution; rice soil testing formula fertilization avoids the blindness of farmers' conventional experience fertilization It has a very significant effect on increasing rice yield, increasing income and improving fertilizer use efficiency. However, the target yield of soil testing and formula fertilization is based on the pursuit of the highest yield and the best yield increasing effect of fertilization. The short-term benefit of the field lacks comprehensive consideration of environmental impacts such as soil environment, surface / ground water resources, and nitrogen and phosphorus loss, so it is difficult to meet the needs of sustainable development of an environmentally friendly farmland ecosystem

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