CAJ | 학술논문

以籼粳杂交稻品种甬优2640、甬优1640,杂交籼稻品种丰两优香1号、新两优6380为材料,设置6个密度(A：31.7 cm ×30.0 cm、B：22.2 cm ×30.0 cm、C：17.1 cm ×30.0 cm、D：13.9 cm ×30.0 cm、E：11.7 cm ×30.0 cm、F：10.6 cm ×30.0 cm),比较研究不同机插密度对不同类型水稻抗倒伏能力的影响。两年试验结果表明,产量随密度的增加呈先升后降的趋势,籼粳杂交稻和杂交籼稻均以13.9 cm ×30.0 cm处理产量最高。密度对两种类型水稻影响也不完全一致,籼粳杂交稻在C~E密度下产量均高于10.5 t hm–2,且未发生倒伏或倒伏较少,能获得高产稳产；杂交籼稻只有在D密度下产量高于10.0 t hm–2,表观倒伏率较高,较难稳产。随着密度的增加,2个类型品种茎秆的倒伏指数逐渐增大,茎粗、单位节间干重、茎壁厚度都呈下降趋势。随着灌浆时间的增加,籼粳杂交稻倒伏指数先升高后降低,高峰值出现在抽穗后30 d,茎壁厚度、节间充实度、单茎茎鞘重先降低后升高,抽穗后30 d达最低值。杂交籼稻倒伏指数一直升高,茎壁厚度一直下降,节间充实度先下降,抽穗后30 d后略有下降或回升但不明显,单茎茎鞘重先降低后升高,抽穗后30 d最低,抽穗后30 d前后是发生倒伏的敏感时期。
이선갱잡교도품충용우2640、용우1640,잡교선도품충봉량우향1호、신량우6380위재료,설치6개밀도(A：31.7 cm ×30.0 cm、B：22.2 cm ×30.0 cm、C：17.1 cm ×30.0 cm、D：13.9 cm ×30.0 cm、E：11.7 cm ×30.0 cm、F：10.6 cm ×30.0 cm),비교연구불동궤삽밀도대불동류형수도항도복능력적영향。량년시험결과표명,산량수밀도적증가정선승후강적추세,선갱잡교도화잡교선도균이13.9 cm ×30.0 cm처리산량최고。밀도대량충류형수도영향야불완전일치,선갱잡교도재C~E밀도하산량균고우10.5 t hm–2,차미발생도복혹도복교소,능획득고산은산；잡교선도지유재D밀도하산량고우10.0 t hm–2,표관도복솔교고,교난은산。수착밀도적증가,2개류형품충경간적도복지수축점증대,경조、단위절간간중、경벽후도도정하강추세。수착관장시간적증가,선갱잡교도도복지수선승고후강저,고봉치출현재추수후30 d,경벽후도、절간충실도、단경경초중선강저후승고,추수후30 d체최저치。잡교선도도복지수일직승고,경벽후도일직하강,절간충실도선하강,추수후30 d후략유하강혹회승단불명현,단경경초중선강저후승고,추수후30 d최저,추수후30 d전후시발생도복적민감시기。
In order to study impacts of planting density of mechanical-transplanting rice on lodging resistance and yield, a field experiment was conducted usingindica-japonica hybrid rice Yongyou 2640, Yongyou 1640 andindica hybrid rice Fengliangy-ouxiang 1, Xinliangyou 6380 with six planting densities (A: 31.7 cm × 30 cm, B: 22.2 cm × 30.0 cm, C: 17.1 cm × 30.0 cm, D: 13.9 cm × 30.0 cm, E: 11.7 cm × 30.0 cm, F: 10.6 cm × 30.0 cm). The experimental results were as follows. With the increasing of transplanting density, the yield increased firstly and decreased then, with the highest yield at 13.9 cm × 30.0 cm, both forin-dica-japonica hybrid rice andIndica hybrid rice. The effects of densities on the two types of varieties were not entirely consistent. Under the densities of C–E, the yield ofindica-japonica hybrid rice was higher than 10.5 t ha–1, and little or no lodging occurred. Therefore, we could obtain high and stable yield. Under the density of D, the yield ofindica hybrid rice was higher than 10.0 t ha–1, and the apparent lodging rate was also higher, so it was difficult to obtain stable yield. With the increasing of transplanting densities, lodging index of two types of rice increased, and stem diameter, wall thickness of culm and dryweight of aunit inter-node in two types of rice decreased. With increasing filling time, lodging index of indica-japonica hybrid rice increased firstly and decreased then, with the peak value at 30 days after heading, wall thickness of stem, plumpness of internode and single stem weight decreased firstly and increased then, with a minimum value at 30 days after heading. Lodging index ofindica hybrid rice was increasing, stem wall thickness was decreasing, plumpness of internode decreased firstly then decreased or increased slightly at 30 days after heading, but not obvious, single stem weight decreased firstly and increased then, with a minimum value at 30 days after heading. The sensitive period of lodging was around 30 days after heading.