Chinese Journal OF Rice Science >
Study on Yield Formation and Population Quality of indica Hybrid Rice with Good Quality and High Yield Under Mechanical Direct Seeding
Received date: 2018-02-05
Revised date: 2018-03-15
Online published: 2018-09-10
【Objective】Our aim is to explore the common characteristics of high-yielding and high quality indica hybrid rice varieties suitable for mechanical direct seeding in plain (Chongzhou) and hilly (Santai) areas and establish a standardized selection method and evaluation criteria for it, which could lay a theoretical and practical basis for the integration of hybrid indica rice mechanized seeding technology.【Method】Twenty-nine indica hybrid rice combinations were used as materials in two ecological zones, artificial simulated mechanized precise hill-seeding (mechanical direct seeding for short), and the effects of mechanical direct seeding on the population quality characteristics and yield of high-quality indica hybrid rice with different yield levels in plain and hilly areas were studied, the relationship between population quality characteristics and yield of high-quality indica hybrid rice combinations by mechanical seeding was also discussed.【Results】The results showed that, by cluster analysis based on average grain yield of each cultivars in the two areas, the 29 tested combinations could be classified into three groups: high-yielding, mid-yielding, and low-yielding. In the total tested cultivars, high-yielding combinations from Santai accounted for 17.24%, and other types covered 82.76%, high-yielding varieties from Chongzhou were 10.34%, and other types were 89.66%. Compared with the middle-yield and low-yielding varieties, the common high yielding varieties were featured by strong tillering ability, more effective panicles, higher seed-setting rate, higher leaf area index(LAI) after jointing stage and higher dry matter accumulation, moreover, its leaf length, leaf position, leaf opening angle of top three, plant height, top light energy intercept during filling exceled obviously. In addition to population light transmittance, leaf opening angle, tillering LAI and dry matter accumulation, correlation analysis indicated that there existed significantly or highly significantly positive correlations (r=0.37*-0.90**) between index of population quality and yield under mechanical direct-seeding, especially between high efficiency LAI rate at full heading, dry matter accumulation at maturity, and harvest index and yield.【Conclusion】High-yielding varieties have higher panicle and grain number per panicle, and seed-setting rate and high growth at late growth stage. That is how it can obtain higher yields under mechanical direct-sowing.
Changchun GUO, Zhibai SUN, Yongjian SUN, Yaozhu YIN, Yunxia WU, Yuan TANG, Zhiyuan YANG, Kaihong XIANG, Jun MA . Study on Yield Formation and Population Quality of indica Hybrid Rice with Good Quality and High Yield Under Mechanical Direct Seeding[J]. Chinese Journal OF Rice Science, 2018 , 32(5) : 462 -474 . DOI: 10.16819/j.1001-7216.2018.8016
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