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Study on the "Four Less and Four Higher" Cultural Model of Early Rice in Anhui Province

Huang Zongqing Jiang Zhiyun Li yisong et al. (Dept. of Agronomy, Anhui Agricultural College)  
Experiments were conducted on early rice' 8B40 and ZaoXuan213' using the design of rotation regression orthogonal conbination in Wuhu and Shuchen counties from 1990 to 1991. Experiments consisted of five factors each with 5 levels: seeding age, bunches/mu, nitrogen, phosphorous, and potassiun application. The data gained by statistical analysis indicate that the factor effects on the paddy yield and the main components are very remarkable as are proved through the respective quadratic regression equations. Results from the (?)imulant selection show that there are 574 Combinations lurned out yield over 450kg/mu. The agricultural measues for over 95% of the confident interval are the seeding age about 29—30 days, 30—35 thousand bunches/mu, N--P_2O_5—K_2Osucessively 11—12, 3.8—4 and 12—13 kg/mu. Based on the experimental results, field example, and demonstration, a cultural model that coordinated with the regression mathematical model was worker out witch includs technical route, components of yield, and the system of cultivated techniques. Properly reduce seed quantity/mu, bunches/mu, tiller manuring and quantity of irrigation in order to increase the effective panicles, rate of fruits, and grain weight/panicle and to get high yield and best benefit.
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