气候变暖情况下播期对陇东旱塬春玉米的影响

选取陇东旱塬区主栽玉米先玉335为试验材料,在4月5日至5月5日设置7个播期对陇东旱塬春玉米生长发育、产量形成和水分利用的影响进行研究。结果表明,不同播期玉米各生育阶段积温存在差异,全生育期所需活动积温与有效积温受播期影响显著,播期提前或推后均可以在一定程度上增加陇东旱塬春玉米产量,但播期提前较推后可以获得更高产量。株高随播期的推迟增高,穗长、穗粒数、秃尖长等果穗性状指标没有显著差异。从研究结果来看,陇东旱塬4月5～20日播种春玉米均可获得较高产量,但4月5日播期耗水量显著高于其他播期,水分利用效率较低。

Impact of Sowing Date on the Spring Maize in the East of Gansu at Global Warming Environment

Select the main cultivated maize Xianyu 335 as the material in the east of Gansu,set 7 sowing dates on the growth from April 5th to May 5th,the yield formation of spring maize in dryland and water use were studied in the global climate warming environment.The results showed that there were differences in the accumulated temperature of different sowing-season maize at different growth stages,the whole growth period of the required active accumulated temperature and the effective accumulated temperature significantly affected by sowing date,sowing earlier or later can increase maize dryland spring maize yield to a certain extent,but the sowing date earlier than later can obtain higher yield.Plant height increased with the delay of sowing date,there was no significant difference in panicle length,grain number per spike,bald,ear characters.The results showed that if the sowing date of spring maize at April 5 to 20,the yield was higher;but the sowing date at April 5,the water consumption was significantly higher than that at the other sowing date,and the water use efficiency was low.