Effects of Different Seeding Date on Growth and Yield of Rice of Different Growing Types
Effects of sowing date on the growth and development progress and yield of different rice varieties were discussed to provide the scientific theoretical basis for selecting appropriate sowing dates for rice varieties of Jilin Province.The mid-early maturing variety Changbai 25 and the mid-late maturing variety Jijing 88 were used as test materials.By setting five sowing periods,the growth performance,yield and dry matter accumulation of rice were studied.The results showed that with the delay of sowing date,the effective tillering critical periods of Changbai 25 and Jijing 88 were both delayed.The growth periods were shortened,the plant height and the above-ground dry matter decreased,and the yield reduced.And for the late-maturing variety Jijing 88,the impact was more significant.The shortened ranges of the growth period of two varieties were as follows:as the sowing date delayed for 7 d,Changbai 25 decreased with an average of 5 to 6 d,Jijing 88 decreased with an average of 6 to 7 d.There were significant differences between effects of sowing dates on the yield components of two varieties.The effect of Changbai 25 was:number of grains per panicle ＞ numbers of panicle ＞ seed setting rate ＞ 1000-grain weight;while that of Jijing 88 was:seed setting rate ＞ numbers of panicle ＞ 1000-grain weight ＞ number of grains per panicle.
NETL
NSTL
万方数据
维普
