不同栽培条件对中籼稻茎秆抗倒伏性状的影响

研究了6个抗倒性不同的中籼稻品种在3个氮肥水平,3种栽插密度下的茎秆物理性状。分析了它们与植株抗倒性能的关系。结果表明:栽培条件不同,植株株高不同,株高与抗倒性的关系亦不同。茎秆第一伸长节间长度与植株抗倒性能呈负相关,第二伸长节间长度与植株抗倒性能多呈负相关,第三伸长节间长度与抗倒性能呈正相关;基部茎秆粗度与植株抗倒性能多呈极显著正相关;基部茎秆厚度与植株抗倒性能呈极显著正相关。对倒伏影响较大的是基部茎秆粗度和茎壁厚度,其次是株高、第一、二、三伸长节间长度。稀植利于基部茎秆增粗,秆壁增厚,第一、二伸长节间缩短。氮肥的量既不能过高,也不能过低,而且不同品种对氮肥和栽插密度的要求不同,茎秆物理性状不同,植株抗倒性能也不同。实际生产中,适宜的氮肥水平和栽插密度可以使株高与茎秆物理性状优化组合,增强茎秆抗倒性能。

Influence of Different Cultivation Conditions on Stalk Physical Characteristicsof Medium Matured Rice

Stalk physical characteristics of 6 varieties with different lodging-resistances at 3 nitrogen levels and 3 planting densities were studied. The relationships between stalk physical characteristics and lodging resistances of the plants were analyzed. The results indicated that the plants height were different, the relationships between the plants height and lodging resistances were also different under different cultivation conditions. The plant lodging resistance was negatively correlated with the length of the first internode, and most negatively correlated with the length of the second internode, and positively correlated with the length of the third internode; and most significantly positively correlated with the area of the basal stalk; and significantly positively correlated with the thickness of the basal stalk. Most effect of lodging were the area and thickness of the basal stalk, secondly, plants height and the length of the first, second and third internode. Sparse conditions, the area and thickness of the basal stalk increased and the length of the first and second internode reduced. The amount of nitrogen could neither too high nor low, further more, different types of species required different volume of nitrogen and planting density. There were evident differences between varieties in the stalk physical characteristics and the plants lodging resistances. In the actual production, the fit nitrogen levels and planting densities could settle the plants height and stalk physical characteristics at a better level, could increase stalk lodging resistances.