Effects of Different Concentrations of Salt Stress on Agronomy and Yield Traits of Direct Seeding Rice
The effects of salt stress on the growth and yield of rice under direct seeding cultivation were studied by pot experiment using Fuyuan No.4 as experimental material.The results showed that with the increase of salt stress degree,the seedling emergence rate,survival rate,tillering rate per plant,heading rate,leaf area,biomass,plant height,harvest index and yield of rice showed a decreasing trend in different degrees,and the growth period was delayed.When salt content≥1.23‰,there was a significant difference in ear number compared with CK.When salt content was greater than 1.36‰,there were significant differences in seedling emergence rate,tillering rate per plant,heading rate per plant and growth period compared with CK.When the salt content was more than 1.92‰,there were significant differences in above-ground biomass and yield in comparison with CK.When salt content≥3.10‰,there were significant differences in seedling formation rate,leaf area,plant height,harvest index,grain number per panicle,1000-grain weight and seed setting rate in comparison with CK.When the salt content was more than 4.95‰,there was basically no rice yield.Among the yield composition factors,panicle number was very sensitive to salt stress and was the leading factor of yield reduction;the number of grains per panicle,seed setting rate and 1000-grain weight were relatively more sensitive to salt stress,wasthe secondary factors,and were similar in the response degrees to salt stress.These indexes can be used as important reference indexes for direct rice planting and soil improvement and utilization in Ningxia saline-alkali land.
Salt stressPot plantingDirect seeding riceDegree of responseYield
NETL
NSTL
万方数据
