种植密度对膜下滴灌水稻产量及其构成因素的影响

研究了高沙土地区膜下滴灌水稻(Oryza sativa L.)不同种植密度对水稻群体发育与产量形成的影响。结果表明,与其他密度处理相比,密度为390万苗/hm~2时水稻产量最高。随着播种密度增大,最高苗数和有效分蘖均增多,但无效分蘖也增多,成穗率降低,每穗粒数减少。通过相关性分析表明,产量与有效穗数呈极显著正相关,有效穗数与每穗粒数呈显著负相关。在现有水平下,考虑到成穗率及后期倒伏危险,该地沙性旱作地区适宜播种密度在300万苗/hm~2左右,可获得9 860 kg/hm~2产量。

Effects of Planting Densities on Grain Yield and Its Components of Rice under Drip Irrigation with Plastic Film Mulching

The effects of planting densities on growth,grain yield and its components of rice (Oryza sativa L.) under drip irrigation with plastic film mulching at the sandy dryland areas were studied.The results showed that,the density of 3.9 million plants/hm2 got the higher yield compared with other densities.With the increase of plant density,tiller numbers peak value,effective panicles,unavailable tiller and grain number increased,percentage of culms and grains per ear decreased.The correlational analyses were conducted that the yield per unit area was significantly positively correlated with the effective panicles,while the effective panicles was significantly negatively correlated with grain number per ear.Thus,the seeding plants could be guaranteed about 3 million plants/hm2 as to get a high yield of about 9 860 kg/hm2 at the sandy dryland areas to avoid the low spike rate and lodging risk at the local sandy dryland area.