Density Cultivation Of Three-line Hybrid Rice "barrel Excellent 202 Trials And Seed Technology Research And Applications

The newly rice cultivar of "Tong you 202", which has been bred by the rice research institute of Guizhou University and the Seed General-Station of Guizhou Province according to the provincial situation, will be discussed in this article. The writer has done the research in three aspects according to its potential and its role in Guizhou's rice production.I. The best density of the cultivar and the related physiological characteristics, production characters in central parts of Guizhou for finding new way in promoting the production outputs. The experiment result shows:1. We will get the most outputs if it is planted at a density of 150, 000 grains per hm~2 , that is, 9889.4 kg per hm~2 ; as the density of plantation gets larger, whereas the outputs, grains on each plant and the rate of the bear fruit decrease relevantly, however, the height of the plant and the effective spike get higher.2. In different plant densities from young plants to grouting plants, the content of phosphorus nitrogen and potassium declines relatively.II The "Tong you 202" technique has been put forward at the basis of his experimental plantation in Hainan and the characteristics of "Parents Tong you 202". The technique, in processing the highly produced outputs, has also been experimented and amended in some suitable places for plantation in Guizhou. III. Some solutions have come out for the problems appeared during our popularizations in different parts of Guizhou. 1 .The solution for the seasonal febrile diseases: 1) to identify the variety of itself and its parents of "Tong you 202"; 2) to group with other excellent varieties; 3) to pay more attention to the managements and the disease prevention. 2. The dissemination of the characteristics of "Tong you 202" and how we can stop the disease and the advise on the spot. 3. The advice on newly cultivations in the paddy fields with fish.