Effect of different transplanting time and irrigation amount on growth and yield of late-maturing rice

Climate changes led to gradual reduction of agricultural water and caused lack of water for most of crops,especially for rice production.In order to alleviate the shortage of water resources and enhance the rice planting adaptability to climate changes,experiments were carried out on the test base of Shenyang Agricultural University in 2009 using late-maturing rice variety Liaoxing No.1 as test material to avoid the spring water peak by delay transplanting and reducing the quantity of irrigation water during rice growth period to improve production efficiency.The test set three transplanting time(May 5,20 and June 5) and four irrigation treatments(drought irrigation,shallow,thin,wet and dry irrigation,intermittent irrigation and normal irrigation).The growth,development and yield of Liaoxing No.1 changed under several irrigation conditions.The results showed that the dry weight,ear length,1000-grain weight and grain filling rate were largest under regular irrigation of transplanting on June 5,and which were maximum when rice transplanted on May 5 and 20.Tiller numbers showed a single peak curve at different transplanting stages.Under intermittent irrigation the irrigation amount of transplanting on June 5 was less than that of transplanting on May 5 and 20,the interval were respectively 658.64 m3/hm2 and 522.86 m3/hm2,the water saving amount were 6.52% and 5.25%.The yield of transplanting on June 5 under intermittent irrigation was 9 297.15 kg/hm2,which decreased by 6.54% and 12.70% compared to that of May 5 and 20.