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【目的】比较研究3种类型钵苗不同摆栽密度下的水稻氮素吸收利用与转运特征。【方法】以超级稻品种武运粳24和南粳44为供试材料,采用新型3连孔、2连孔塑盘育秧,以常规单孔塑盘育秧为对照,并分别设置5种不同栽插密度,研究各处理氮素吸收利用与转运特征的差异及其与产量的关系。【结果】3种类型钵苗摆栽不同基本苗之间,抽穗期和成熟期氮素吸收量、氮素农学利用率、氮素吸收利用率以及偏生产力随移栽基本苗增加均表现为先增大后减小的趋势。不同类型钵苗之间,抽穗期和成熟期氮素吸收量、氮素农学利用率、氮素吸收利用率和偏生产力均表现为:在较低基本苗条件下(36×104—54×104·hm-2),单孔>2连孔>3连孔;在中等基本苗条件下(72×104·hm-2),2连孔>单孔>3连孔;在较高基本苗条件下(90×104—108×104·hm-2),2连孔、3连孔>单孔。3种类型钵苗摆栽最高产量条件下,抽穗期和成熟期氮素吸收量、氮素农学利用率、氮素吸收利用率以及偏生产力均表现为2连孔>3连孔>单孔。3个最高产量处理的相关分析表明:水稻产量与成熟期叶片、地上部分吸氮量,拔节至抽穗期、抽穗至成熟期地上部分阶段吸氮量呈显著或极显著的正相关。【结论】在适宜或较高移栽密度条件下,与单孔相比,2、3连孔稀植摆栽尤其是2连孔摆栽水稻在生育中、后期氮素积累量较多,氮素利用效率较高,是氮高效的省工高产栽培新途径。
【Objective】 The objective of this study was to compare the characteristics of nitrogen uptake and utilization and translocation of rice under different planting densities in three types of seedlings. 【Method】 The super hybrid rice Wuyunjing 24 and Nanjing 44 were used as experimental materials. The new three-hole and two-hole plastic plates were used as the experimental materials. The conventional single-hole plastic plates were used as the control. Density of intercropping, the differences of nitrogen absorption and utilization and translocation in different treatments and their relationship with yield were studied. 【Result】 The results showed that N application rate, N use efficiency, N use efficiency and partial yield of heading seedlings of three types of seedlings planted with different basic seedlings at heading and maturity were all increased firstly Increase and then decrease the trend. Under different types of seedlings, the nitrogen uptake, nitrogen use efficiency, nitrogen uptake efficiency, and partial yield at heading and maturity stages were as follows: Under the condition of low basic seedling (36 × 104-54 × 104 Hm-2), single well> 2-well> 3-well. Under moderate basal conditions (72 × 104 · hm-2) Under the (90 × 104-108 × 104 · hm-2), 2 even hole, 3 even hole> single hole. Under the highest yield of three types of seedlings, the nitrogen uptake, nitrogen use efficiency, nitrogen uptake and utilization efficiency, and biotic productivity at heading and maturity all showed 2-hole> 3-hole> single hole. The correlation analysis of the three highest yield treatments showed that there was a significant or extremely significant positive correlation between the rice yield and the nitrogen uptake in leaves, aboveground nitrogen uptake, jointing to heading, heading to maturity. 【Conclusion】 Under suitable or higher transplanting density, compared with single-hole, 2,3-hole thinning and transplanting, especially in 2-hole pendulum-planting rice, had more nitrogen accumulation in the middle and later stages, Sufficient use of high efficiency, high efficiency and efficient cultivation of new ways of high-yielding workers.