Nitrogen and phosphorus emission-reduction method of rice water and fertilizer ecological coupling management

Abstract

The invention discloses a nitrogen and phosphorus emission-reduction method of rice water and fertilizer ecological coupling management, which comprises a rice field water management and a rice field nutrient management. The water management of rice field adopts a time selective dry-wet alternate water-saving ecological irrigation mode, comprising the following steps: (1) after the rice is transplanted for 10-14 days, starting irrigation intermittently and irrigating the rice field to an original field surface water depth of 60-80mm; (2) irrigating until the water depth reaches the original field surface water depth when the field surface water declines and dries naturally to a water depth of 50-100 mm under the surface soil; (3) performing the step 2 repeatedly, stopping repeating the step 2 and maintaining the field surface water depth of 10-80 mm during the booting stage and flowering stage of rice in the repeating step 2 procedure; and (4) when the flowering stage is over, continuing to repeat the step 2 until the rice is yellow maturity; and harvesting rice when the field surface water declines and dries naturally to a water depth of 0-10 mm under the surface soil. The nutrient management of rice field adopts an ecological fertilizing mode at the right time and at the right place.

Description

technical field [0001] The invention relates to an optimized management of rice irrigation and fertilization to reduce non-point source pollution. Specifically, it is a water and fertilizer management nitrogen and phosphorus emission reduction technology coupled with rice dry-wet alternate ecological irrigation and timely and appropriate ecological fertilization, which is environmentally friendly Agricultural non-point source pollution control and environmental protection. Background technique [0002] my country's rice planting area reaches 31 million hectares, accounting for 27% of the total area of ​​food crops in my country. It is the crop with the largest amount of irrigation water and the largest amount of chemical fertilizers in my country. On the one hand, the waste of irrigation water in farmland is quite serious, and the utilization efficiency of irrigation water is only about 0.45; etc., nitrogen fertilizer use efficiency is only 30% to 35%. Unreasonable water a...

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Problems solved by technology

However, these water management and nutrient management have not been reasonably coordinated and coordinated by comprehensively considering factors such as rice yield, fertilizer input, and environmental pollution. Exhaust pressure is still severe

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