Studies on Genotypic Difference of Effect of Potassium Fertilizer and Irrigation Mode on the Growth,Development and Yield Forma.pdf

1、 In recent years, with the increase in rice yield, the lack of K in rice is much more serious, and this problem is becoming one of the most important factors which limit rice production. Although applying K fertilizer

2、 can solve this problem, the increase in cost of production and the limitation of the resource of K in China and the world make it unfeasible, since the exhaustion of this resource will be a severe obstacle to agricultur

3、al sustainable development. In addition, there are significant differences in K nutrition of rice between different genotypes. Whiles the production of some varieties increase as the application of K fertilization is car

4、ried out, that of others are stable or decrease. So the study and utilization of the rice genotypic difference in K nutrition to enhance the efficiency of K nutrition and improve adaptability to low K could be considered

5、 as an effective approach of solving the problem of lack of K in rice. Drought is another important factor effecting crop yield and one important measure towards increasing food production is enhancing the drought resist

6、ance in crops and adopting a water saving irrigation to increase efficiency of water utilization. Therefore, the research of the impact of K nutrition and irrigation mode on development and the formation of yield and th

7、e physiological and morphological characteristics of rice will be the important theory foundation and practical instruction to screen rice genotypes of low K tolerance and drought resistance. It will help us to solve the

8、 problem of potassium deficit and water shortage while increasing the yield of rice. The highest potassium content in rice plant is in the stem followed by the sheath, then the leaf and the lowest potassium content is

9、the grain. Among various organs of rice, it is in the leaf that the potassium content is greatest affected by potassium and irrigation mode, followed by stem and sheath, and it is grain that is least affected. Applic

10、ation of potassium fertilizer can significantly increase the potassium concentration in various organs of rice. Upland can significantly decrease the potassium concentration in leaf and grain of rice, but increase th

11、e potassium content in stem and sheath. It is G2 that the potassium content of plant is lightest affected by potassium level and irrigation mode. The potassium concentration of G4 and G6 are greatly affected by pot

12、assium level and irrigation mode.9.The potassium and irrigation mode can obviously affect the nitrogen content of rice plant. Meanwhile, there are significant differences in different rice genotypes in the effect of

13、potassium and irrigation mode on the nitrogen content of rice plant. Application of potassium fertilizer enhances an increase in the nitrogen content in rice grain. Upland is favors of rise in nitrogen content in ric