Effects Of Cultivation Measures On Growth And Yield Of Four Rice Varieties

The formation of rice yield is directly related to the ecological environment and cultivation measures.Appropriate sowing date,basic seedling number and nitrogen application amount will have a greater impact on rice growth and yield.It is an important technical way to study the supporting cultivation measures and promote the high yield and high efficiency of rice varieties.In this experiment,the effects of sowing date,basic seedling number,nitrogen application rate and water depth on Rice Yield and growth period were studied through field cultivation experiments of four different rice varieties.The main conclusions are as follows:(1)The effects of sowing date on the whole growth period of Fengliangyouxiang 1,Green Rice Q7,Changnongjing 1 and Yongyou 8 rice varieties reached a significant level,while the effects of transplanting density and nitrogen application rate on the whole growth period of each rice variety did not reach a significant level.Within the experimental level,the growth period of the four rice varieties was gradually shortened with the delay of sowing date.(2)The effects of sowing date,basic seedling number and nitrogen application rate on the yield of Fengliangyouxiang No.1,green rice Q7,Changnongjing No.1 and Yongyou No.8 reached a significant level,and the effects of nitrogen application rate on the yield of each variety reached a significant level,while the effects of transplanting density and water on the yield of four rice varieties were relatively small.The optimum cultivation conditions of rice can be obtained by range analysis.Selenium is a very important trace element,which plays an active role in maintaining human health and the growth and development of higher plants.Suitable selenium concentration can promote seed germination and seedling growth.Soaking seeds in Na2SeO3 solution with appropriate concentration can effectively improve seed germination rate and seed vigor.Low concentration of selenium treatment can improve the germination rate of peanut seeds,while high concentration of selenium treatment can inhibit the germination of peanut seeds.Similar results were obtained in the germination experiments of tomato and wheat seeds soaked with selenium.By studying the effects of selenium soaking on the germination rate and growth status of rice seeds,we can improve the germination rate and promote the growth of seeds,so that we can cultivate strong seedlings in agricultural production,and lay a foundation for high-yield and high-quality cultivation of rice.According to previous studies,different rice varieties were selected for germination experiments with different seleniumconcentration and soaking time.The following conclusions were drawn:(3)At the same soaking time,the low concentration of selenium solution can improve the germination rate and germination potential of seeds.The overall performance is "low concentration effectively promotes,medium concentration decreases steadily,high concentration sharply inhibits";12 hours soaking,0.5,1 mg/L treatment is conducive to seed germination and root growth,slightly higher than the optimal soaking concentration of seed germination,with the prolongation of soaking time,0.2,0.5 mg/L./ L treatment was beneficial to the growth of seed buds and roots.(4)There is a difference between the optimum seed soaking concentration for seed bud growth and the optimum seed soaking concentration for seed germination promotion.It may be that the difference between seed soaking causes the difference of selenium absorption during seed imbibition,which results in the inhibition rate of seed rooting and bud growth is greater than that of germination inhibition.The test of intersubjective effect showed that the effects of soaking time and selenium concentration on seed bud length were very significant,and the interaction between them had a significant difference on seed bud length;soaking time had a significant difference on seed root length,and the effect of selenium concentration on seed root length was very significant,and the interaction between them had a significant difference on seed root length.