Chinese Journal OF Rice Science >
Effects of Sowing Densities on Quality and YieldFormation of Hydroponically Grown Long-mat Rice Seedlings Under Mechanical Transplanting
Received date: 2017-08-29
Revised date: 2017-11-22
Online published: 2018-05-10
【Objective】The objectiveof the research is to determine the suitable sowing density of hydroponically grown long-mat rice seedlings(HLMS) under mechanical transplanting. 【Method】The effects of sowing densities on seedling quality, mechanical transplanting quality, field growth characteristics and yield of HLMS were analyzed. A widely grown conventional japonica rice cultivar (Wuyunjing24) and an indica hybrid rice cultivar (6Liangyou9368) were used as test materials. 【Result】Dry weight of shoot and root, root-developing ability, root activity, seedling emergence rate, seedling base stem diameter, dry weight per unit of seedling height and photosynthetic rate were significantly increased and the leaf area index was significantly decreased with decreasing sowing density for both cultivars before transplantation. There were advantages of seedling reviving in the paddy field, tillering capacity and spikelet number per panicle for thin sowing treatments, but less basic seedlings and paniclesat too lowsowing density. The grain yield was not decreased significantly when the sowing density reduced to 738.9g/m2 for Wuyunjing 24 and 431.0g/m2 for 6Liangyou9368, respectively. However, the yield was decreased significantly when sowing density reduced continuously for both cultivars. 【Conclusion】 The suitable sowing density of HLMS was 2.03 cm-2for Wuyunjing24 and 1.14 cm-2 for6Liangyou9368, respectively.
Key words： rice (Oriza sativa); yield; mechanical transplanting; seedling; sowing density
Yuxiang LI, Zhizhou HE, Yanfeng DING, Shaohua WANG, Zhenghui LIU, She TANG, Chengqiang DING, Lin CHEN, Ganghua LI . Effects of Sowing Densities on Quality and YieldFormation of Hydroponically Grown Long-mat Rice Seedlings Under Mechanical Transplanting[J]. Chinese Journal OF Rice Science, 2018 , 32(3) : 247 -256 . DOI: 10.16819/j.1001-7216.2018.7103
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