Method for detecting saturation capacity of available phosphorus in paddy soil

Abstract

The invention discloses a method for detecting the saturation capacity of available phosphorus in paddy soil. The method comprises the steps of A. selecting a test field; B. setting plots, namely, setting the quantity of the plots according to the test treatment number and the repetition number; C. constructing the plots, namely, after the test field is selected, irrigating the paddy soil, laying color band cloth on a ridge and a sidewalk; D. fertilizing the plots, namely, mixing a fertilizer and soil manually after fertilizing; E. raising rice and seedlings and transplanting the rice seedlings, namely, selecting super hybrid rice for the rice variety; F. irrigating the plots, namely, opening small trenches between the plots and main trenches when irrigating the plots, irrigating water into the plots, draining and drying the field in the later mature period; G. intertilling and weeding; H. controlling pests; I. harvesting the rice in sunny days to obtain rice in each plot; J. sampling soil; K. determining a soil sample; and L. calculating a result. According to the method, the accuracy is high, operation and practicability are strong, and determining of the saturation capacity of the available phosphorus in the paddy soil is facilitated. The high yield of rice is achieved, and the problem of environment pollution caused by phosphorus loss in the paddy field is prevented.

Description

technical field [0001] The invention relates to the technical field of soil nutrient research, and more specifically relates to a method for measuring the available phosphorus saturation capacity of paddy field soil, which is suitable for application in the measurement of the available phosphorus saturation capacity of various paddy field soils. Background technique [0002] Phosphorus is one of the macronutrients necessary for plant growth and development. In order to meet the needs of high-yield crops, people use large amounts of chemical fertilizers and manure on farmland for a long time, resulting in the accumulation of soil phosphorus. When the accumulation of phosphorus in farmland soil reaches a certain level, the release of soil phosphorus will increase greatly, resulting in the loss of phosphorus and water eutrophication. change. This not only reduces the economic benefits of fertilizers, resulting in economic losses, but also increases the risk of water pollution....

AI Technical Summary

Problems solved by technology

The former method actually estimates soil phosphorus saturation based on the ratio of soil phosphorus content to iron and aluminum content, without considering the impact of factors such as tillage management and water on soil phosphorus saturation. Zhang Mingkui et al. found in 2006 that rice The soil phosphorus saturation measured after the soil was cultivated under anaerobic conditions was significantly lower than that measured under aerobic conditions

The latter method is also measured under indoor culture conditions, without considering the effects of soil crops, microorganisms and field moisture conditions on soil phosphorus saturation

In addition, these methods are all based on dryland soil, and there is a big difference between paddy field soil and dryland soil in farming management, especially paddy soil has been flooded for a long time, so the soil phosphorus saturation determination method based on dryland soil is adopted. Whether it is suitable for paddy soil is worth exploring

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