播量对滴灌春小麦群体生长、冠层光分布及产量的影响

Effects of Sowing Rate on Population Growth,Canopy Light Distribution and Yield of Drip Irrigated Spring Wheat

为探究播量对滴灌春小麦群体生长、冠层光分布及产量的影响,以新春6号为材料,设置5个播量处理[300kg.hm-2(M1)、375kg.hm-2(M2)、450kg.hm-2(M3)、525kg.hm-2(M4)、600kg.hm-2(M5),以450kg.hm-2的畦灌为对照(CK)]开展田间试验。结果表明,滴灌春小麦产量与播量呈单峰曲线关系,处理间差异显著,其中M3处理产量最高,比CK增产29.3%。随播量增加,光合势(分蘖至灌浆)有逐渐增大的趋势,但在开花至灌浆期,M3处理光合势和生长速率最大。综合以上结果,在高密度栽培条件下,北疆地区滴管春小麦播量为450kg.hm-2时,能够获得高产、稳产。

To investigate the effects of sowing rates on population growth, canopy light distribution and yield of drip irrigated spring wheat in Northern Xinjiang, a study with 5 treatments of sowing ratewas conducted using the dominant cultivar Xinchun 6 （Triticum aestivum L. ） at experimental sta- tion of Shihezi University in the year of 2009--2010. The treatments for sowing rate were as 300 kg · hm-2（M1）, 375 kg. hm 2（M2）, 450 kg· hm 2（M3）, 525 kg. hm 2（M4） and 600kg. hm 2（M5）, respectively, and 450 kg hm-2 was used as CK. Results showed that, the relationship between wheat yield and sowing rate was as a single-peak curve, reaching to a maximum yield in treatment M3, which was higher by 29.3 than that of CK. The potential photosynthetic capacity increased gradually with the increase of sowing rate from tillering to grain filling stage. Both potential photo- synthetic capacity and growth rate reaching the maximum in treatment M3 from flowering to grain fill- ing stage. In conclusion,under the high planting density,the sow rate of 450 kg ·hm 2 was feasible to obtain the high and stable yield of drip irrigated spring wheat in Northern Xinjiang.