Studies on relationships between different soil types and climate condition and grain yield and quality of rice

The effects of nutrient-supplying ability in different types of soil and different ecological conditions on quality of rice was studied through grey-brown-purple soil, purple soil, brown-alluvial soil, purple-alluvial soil(representing Tuojiang river area), red-brown-purple soil, brown-purple soil, brown-purple soil, lao alluvial yellow soil, purple-alluvial soil(representing Jiouqu river area), grey-brown alluvial soil, red-purple soil etc.and two climate condition.The results showed that soil types affected fully milled rice rate, chalky grain rate, chalkiness and protein content.The fully milled rate of rice in grey-brown-purple soil, brown-alluvial soil and purple-alluvial soil(representing Jiouqu river area)was higher than that in other soil types; but the chalky grain rate and chalkiness of rice was lower than that in other soil types. The chalky grain rate and chalkiness of rice in red-brown-purple soil was almost the same to that in grey-brown-purple soil, brown-alluvial soil and purple-alluvial soil(representing Jiouqu river area).The protein content of rice in grey-brown-purple soil, purple-alluvial soil(representing Tuojiang river area) and red-purple soil was higher than that in other soil type. The results also demonstrated that suitable mean temperature, diurnal range, more sunshine could reduced the chalky grain rate and chalkiness of rice, and increased protein content of rice,and the critical techniques to improve rice quality was to breed new rice variety.