Abstract:

In this paper, a field experiment were conducted under two cultivation patterns in 5 sowing dates, using mid-season hybrid rice varieties Ⅱyou 602 and Jingyou 127 as materials, to study the effects of meteorological factors at different growth stages on grain protein. The results indicated that, the sowing dates, cultivation patterns and varieties had significant effects on the protein content of rice, and the effect on grain protein content ranged from big to small order for sowing dates, varieties, cultivation patterns. There were increasing trend for the protein as the sowing date delayed, the protein increased significantly of the high-nitrogen and low-density treatment than those of low-nitrogen and high-density treatment. The protein content of Ⅱyou 602 were significantly higher than that of Jingyou 127, but the interaction effects of them were not significant at 0.05 level. It is good to the accumulation of grain protein in the condition of higher temperature and more precipitation before earing, and the key weather factors is different between different rice varieties, more precipitation in the whole growth period of rice is beneficial to the accumulation of protein for Jingyou 127, but Ⅱ you 602 would improve rice protein content in the condition of higher daily minimum temperature from jointing to full heading stage, less sunshine time from transplanting to jointing stage and from full heading to mature stage.

Key words: mid-season hybrid rice, meteorological factor, cultivation pattern, rice variety, protein content

摘要：

以杂交中稻品种旌优127和Ⅱ优602为材料，在5个播期和2种栽培方式下，研究了品种、栽培方式及气象因子对稻米蛋白质含量的影响。结果表明，播期、栽培方式及品种对籽粒蛋白质含量均有显著影响，从大到小依次为播期、品种、栽培方式，但三者的互作效应不显著。随着播期推迟，蛋白质含量呈增加趋势，高氮低密处理比低氮高密处理显著提高，Ⅱ优602的蛋白质含量显著高于旌优127。水稻抽穗前各生育阶段气温高、降水量大有利于稻米蛋白质的积累；但不同品种的关键气象因子有所不同，旌优127整个水稻生育期的降水量越多越有利于蛋白质的积累，而Ⅱ优602则表现为拔节-齐穗期的日最低气温越高、移栽-拔节期的日照时数和齐穗-成熟期日照时数偏少有利于提高稻米蛋白质含量。

关键词: 杂交中稻, 气象因子, 栽培方式, 品种, 蛋白质含量