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Acta Agron Sin ›› 2015, Vol. 41 ›› Issue (05): 743-757.doi: 10.3724/SP.J.1006.2015.00743

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effect of Planting Density of Mechanically Transplanted Pot Seedlings on Yield, Plant Type and Lodging Resistance in Rice with Different Panicle Types

HU Ya-Jie1,CAO Wei-Wei1,QIAN Hai-Jun1,XING Zhi-Peng1,ZHANG Hong-Cheng1,*,DAI Qi-Gen1,HUO Zhong-Yang1,XU Ke1,WEI Hai-Yan1,GUO Bao-Wei1,GAO Hui, SHA An-Qin2,ZHOU You-Yan2,LIU Guo-Lin2   

  1. 1 Innovation Center of Rice Cultivation Technology in the Yangtze Valley, Ministry of Agriculture / Jiangsu Key Laboratory of Crop Genetics and Physiology, Yangzhou University, Yangzhou 225009, China; 2 Bureau of Agriculture of Xinghua County of Jiangsu Province, Xinghua 225700, China
  • Received:2014-12-17 Revised:2015-04-02 Online:2015-05-12 Published:2015-04-04
  • Contact: 张洪程, E-mail: hczhang@yzu.edu.cn; Tel: 0514-87979220 E-mail:yajiehu@163.com

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Abstract:

In order to identify the suitable planting density and high-yielding charcteristices of mechanically transplanted pot seedlings of rice (PS) with different panicle types, and clarify the effect of planting density on plant type and loding resitance, a field experiment was conducted using rice cultivar with three panicle types in 2012 and 2013. By setting high, medium and low planting density treatments and using mechanically transplanted carpet seedling as control (CK), we investigated yield and its components, panicle traits, canopy leaf system configuration, physical properties of culm and lodging resistance. Resluts showed as follows: (1) With decreasing planting density, yield of three density treatments in the large panicle cultivar increased firstly and then reduced which was higher than that of CK;,and yield of three density treatments reduced progressively for the medium and small panicle cultivar. With decreasing planting density, number of panicles in all cultivars reduced significantly, and spikelets per panicle increased markedly, but there was no significant difference in grain-filled percentage and 1000-grain weight. (2) With decreasing planting density, in all cultivars with PS, panicle length, grain density, grain weight per panicle, No. of primary branch, No. of secondary branch, No. of grains of primary branch and No. of grains of secondary branch showed a tendency of increase, and were higher than those in CK, but it showed a decreasing tendency in ratio of No. of primary branch to No. of secondary branch and ratio of No. of grains of primary branch to No. of grains of secondary branch. (3) Leaf length, leaf width, leaf basal angle, drooping angle of top three leaves and specific leaf weight from flag leaf to the 3rd leaf in all cultivars with PS were enhanced with decreasing planting density, and were higher than those in CK except for leaf basal angle and drooping angle. (4) With decreasing planting density, length of basal 1st, 2nd, and 3rd internodes were shortened, and culm diameter, culm wall thickness, dry matter weight per unit internode of basal inernodes, neck internode length, stalk length, plant height and gravity center height were increased. (5) The breaking resistance and bending moment of basal 1st, 2nd and 3rd internodes were increased with decreasing planting density, but lodging index was decreased. Therefore, for increasing yield with PS, the large panicle cultivar should reduce planting density appropriately, and increase grain number per panicle; the medium panicle cultivar should coordinate number of panicles and spikelets per panicle, getting a large amount of the total spikelets; the small panicle cultivar should depend on number of panicles. When the plant density reduced in PS, panicle traits and top three leaves area could be improved, but leaf basal angle and drooping angle could be increased; meanwhile, it was benefical to shorten the length of basal internodes and increase culm diameter, culm wall thickness and dry matter weight per unit internode, resulting in enhanced breaking resistance and reduced lodging index.

Key words: Pot seedling mechanically transplanted rice, Planting specification, Yield, Plant type, Lodging resistance

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