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以郑单958为试验材料,以拔节期深松和不深松为主因素、两种施氮模式为副因素,研究拔节期深松对夏玉米干物质生产及光合作用的影响。结果表明,拔节期深松与不深松相比,夏玉米株高、穗位高分别降低了17.3 cm、9.0 cm,茎粗减少了2.7 mm,展开叶片数少1片;延缓吐丝期前叶面积指数(LAI)的增加及吐丝期后LAI的下降;吐丝期穗位叶的气孔导度、胞间CO2浓度、蒸腾速率、净光合速率分别降低了38.0%、25.3%、42.5%、2.0%;开花期前生物量降低了1 519.5 kg/hm2,开花期后生物量下降了168.8 kg/hm2;穗部性状变差,穗粒数下降近100粒,经济系数下降7%,子粒产量减少1 662.0 kg/hm2,拔节期不宜进行深松作业。两种施氮模式对夏玉米生长发育的影响差异不显著,耕作方式和施氮模式交互作用不明显。
Taking Zhengdan 958 as the experimental material, the main factors of subsoiling and subsoiling at jointing stage were studied, and the two nitrogen application modes were the secondary factors to study the effects of subsoiling on the dry matter production and photosynthesis of summer maize. The results showed that the plant height and ear height of summer maize decreased by 17.3 cm and 9.0 cm, respectively, and the stem diameter decreased by 2.7 mm and the number of leaflets expanded by 1 at the jointing stage. Leaf area index (LAI) and LAI decreased after silking stage. Stomatal conductance, intercellular CO2 concentration, transpiration rate and net photosynthetic rate decreased by 38.0%, 25.3% and 42.5% , 2.0% respectively. The biomass before flowering decreased by 1 519.5 kg / hm2 and the biomass decreased by 168.8 kg / hm2 after flowering. The ear traits worsened, the number of spikelets decreased by nearly 100, the economic coefficient decreased by 7% Production decreased 1 662.0 kg / hm2, jointing should not be subsoiling operation. There was no significant difference in the effects of two nitrogen application modes on the growth and development of summer maize. The interaction between the two cultivation methods and the nitrogen application mode was not obvious.