Abstract:

In cold regions like Heilongjiang province of China, low temperature is generally a limit to the growth of rice seedling. This paper reports the effects of the biochemical calefacien (a kind of microbial community) application combined with rice straw on rice seedbed temperature, seedling quality, rice growing seasons and yield characteristics after transplanting in such a region. The conducted field experiments included two parts of the seedbed and the paddy field. Four treatments, i.e., 0, 1.25, 2.5 and 5.0 kg/100 m2 application rates of the biochemical calefacien, were designed with three replicates. The results show that the application of the biochemical calefacient can significantly elevate the temperature of the rice seedbed, improve the seedling quality, promote the rice maturity and increase the rice yield and profit. The best application rate is 5.0 kg/100 m2 with the greatest increases of 8.8% for yield and of 2110 yuan/hm2 for profit.