Abstract:

The unreasonable application of chemical fertilizer in the process of rice production has led to the increase of production cost of agricultural products, farmland environmental pollution and other problems, which could affect the sustainable development of rice production. In 2018-2020, based on single technology research, this study was conducted to form a comprehensive technology model suitable for the double season rice area in South China. In the study, high yield and high efficiency rice varieties (double-high) were selected, and the proportion structure of N, P and K fertilizer and basal tiller fertilizer (double-excellent) were optimized, seaweed extract and microbial agent (double-supplement) were supplemented to chemical fertilizer, and transplanting density was balanced with fertilizer application amount and water management was carried out according to water vapor balance method (double-balance). From 2019 to 2020, the technology demonstration was carried out in Xiangzhou County and Binyang County. Based on the reduction of chemical fertilizer application by 17% (including nitrogen, phosphorus and potassium) in comparison with the control, the average rice yield was 6479.76 kg/hm² and 6755.62 kg/hm² in Xiangzhou and Binyang, respectively, and the rice yield increased by 2.30% and 6.55%, respectively. This paper summarized the technical model of chemical fertilizer reduction and efficiency increase for double-cropping rice in South China.

Key words: South China double-cropping rice, chemical fertilizer reduction and efficiency increase, technical specification, seaweed extract, microbial inoculants