Effects of Different SeedlingAges and Planting Densities on Physiological&nbsp; Characteristics&nbsp; and Grain Yield of Hybrid Rice ⅡYou 498 under TrianglePlanted System of Rice Intensification During Filling Stage

HE  Yangdong1,2, TONG  Ping1， MA Jun1,*,  SUN Yuanyuan3, SUN Yongjian1, LIU Shujin1, XU Yuanming4

doi:10.3969/j.issn.10017216.2011.05.009

2011 , Vol. 25 >Issue 5: 508 - 514

DOI: https://doi.org/10.3969/j.issn.10017216.2011.05.009

Research Papers

Effects of Different SeedlingAges and Planting Densities on Physiological Characteristics and Grain Yield of Hybrid Rice ⅡYou 498 under TrianglePlanted System of Rice Intensification During Filling Stage

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¹ Rice Research Institute, Sichuan Agricultural University, Wenjiang 611130, China; ²Chengdu Vocational College of Agricultural Science and Technology, Wenjiang 611130, China; ³ Agrometeorological Center of Sichuan Meteorological Bureau, Chengdu 610071, China; ⁴ Dongpo Agricultural Bureau, Sichuan Province, Meishan 620032, China;

Received date: 2010-11-23

Revised date: 2011-04-18

Online published: 2011-09-10

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Abstract

The grain yield formation and some physiological characteristics were investigated during filling stage under triangleplanted system of rice intensification (TSRI) at different transplanting seedlingages and planting densities with Ⅱyou 498 as material. The results showed that obvious compensation effect of planting density to transplanting seedlingage of rice under TSRI improved some morphological and physiological characteristics during grain filling stage and promoted yield. Transplanting 2leafage seedlings at a suitable planting density (40 cm × 40 cm) was the best, which increased effective tiller number of plant population, gained reasonable structure of populations, had high leaf area index (LAI) and much higher percentage of efficient LAI, delayed the descending rate of LAI, and enhanced root activity, consequently, promoted dry matter accumulation and transportation during grain filling, and was helpful to coordinate the conflict among filled grain number per panicle, seed setting rate and 1000grain weight. Effective panicle number and grain yield significantly decreased as seedlings were transplanted at 8leaf age stage and lower planting density (50 cm×50 cm). For 5leafage seedlings, the suitable planting density ranged from 30 cm × 30 cm to 40 cm × 40 cm, alleviating the contradiction of crop rotation. In addition, transplanting high leaf age seedlings was easy to accelerate the senescence process of rice during grain filling stage and decreased yield. It was noteworthy that high leaf age seedlings should be transplanted at relatively high planting densities, and the optimum planting density was 30 cm × 30 cm for the 8leafage seedlings.

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HE Yangdong1,2, TONG Ping1， MA Jun1,*, SUN Yuanyuan3, SUN Yongjian1, LIU Shujin1, XU Yuanming4 . Effects of Different SeedlingAges and Planting Densities on Physiological Characteristics and Grain Yield of Hybrid Rice ⅡYou 498 under TrianglePlanted System of Rice Intensification During Filling Stage[J]. Chinese Journal OF Rice Science, 2011 , 25(5) : 508 -514 . DOI: 10.3969/j.issn.10017216.2011.05.009

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