Effects of partial substitution of organic fertilizer for chemical fertilizer on soil and rice growth under different fertility levels
To analyze the effects of organic substitution of partial fertilizers on soil properties and rice growth under different fertility levels,a experiment for rice to replace chemical fertilizers with 15%organic fertilizer with low,medium,and high fertility levels was conducted.Nutrients such as organic matter and alkaline nitrogen,as well as indicators such as 1 000-grain weight,tiller number,and plant height of rice were measured to analyze nutrient absorption and fertilizer input and output.The results showed that,in terms of soil nutrient,compared with conventional fertilization,15%organic fertilizer substitution increased the effective phosphorus content by 24.22%in medium fertility plots,significantly increased the available potassium content by 27.71%in high fertility plots;yield aspect,1 000-grain weight and yield of rice increased by 0.60,0.51,and 0.94 g and 29,143,and 55 kg/hm2,respectively,in plots with low,mediom and high fertility levels;nutrient utilization aspect,the total potassium content of rice straw increased by 78.08%,28.85%,and 29.44%compared with conventional fertilization on plots with 3 fertility levels,respectively;economic benefits aspect,15%organic fertilizer substitution saved fertilizer costs by 187.4 yuan/hm2,and the average output value increased by 196.7 yuan/hm2.In summary,the use of 15%organic fertilizer instead of chemical fertilizers could be beneficial for increasing soil nutrients and rice yield in low,medium,and high fertility plots.The research provides references for reducing fertilizer usage and promoting green rice production.
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