| 【Objective】The application of soil amendment was the main method for soil improvement in acid red
soil rice fields in southern China. The effects of chemical fertilizers with soil amendments on yield and economic benefits
of double-season rice and soil chemical properties were studied to provide theoretical basis and data support for the
improvement of acid red soil rice fields and rational application of fertilizer in southern China. And rational fertilization
provides theoretical basis and data support.【Method】Zhongjiazao 17 and H You 518 were used as experimental materialsto study the effects of chemical fertilizers with four levels of soil amendments (150, 300, 450 and 600 kg/hm2) on soil pH,
available NPK nutrients, soil CEC, grain yield and its components and economic benefits of double cropping rice in acid red
soil paddy fields.【Result】Application of soil amendments could improve the soil pH and CEC of acid red soil paddy field, but
had little effect on the content of available N, P and K in soil. Under the condition of conventional fertilization, the treatments
with soil amendments had no significant effect on the grain yield of early rice, but significantly increased the grain yield of
late rice, with an increase by 4.0%-5.6% compared with the treatment without soil amendments. The yields of early and late
rice showed an increasing trend with the increase of the application amount of soil amendments, but there was no significant
difference between treatments under the condition of reducing fertilizer application by 25%. From the perspectives of the net
profit and output to investment ratio of rice, reducing the application of chemical fertilizer by 25% in early rice and conventional
fertilization in late rice with 150 kg/hm2 soil amendment, respectively, were conducive to improving the economic benefits of
annual rice planting.【Conclusion】The combination of chemical fertilizers and soil amendments has certain improvement
effects on acidification of red soil in southern China, and it can increase rice yield and economic benefits to some extent. |
