Compact plant type rice has higher lodging and N resistance under machine transplanting  

作　　者：DING Chao LUO Xi-kun WU Qiong LU Bo DING Yan-feng WANG Shao-hua LI Gang-hua 

机构地区：[1]Jiangsu Collaborative Innovation Center for Modern Crop Production/National Engineering and Technology Center for Information Agriculture/Key Laboratory of Crop Physiology and Ecology in Southern China,Nanjing Agricultural University,Nanjing 210095,P.R.China

出　　处：《Journal of Integrative Agriculture》2021年第1期65-77,共13页农业科学学报（英文版）

基　　金：the National Natural Science Foundation of China (31871573);the National Key Research and Development Program of China (2016YFD0300505,2017YFD0301200 and 2018YFD0300803);the Jiangsu Key Research and Development Program,China (BE2017369)。

摘　　要：To identify the major factors that contribute to the difference in lodging among different rice varieties under machine transplanting and their responses to nitrogen(N),field experiments were conducted at Danyang County(a representative eco-site of the Lower Yangtze River)in Jiangsu Province,China in 2017 and 2018,22 hybrid indica varieties(HIs),22 inbred japonica varieties(IJs)and two indica japonica hybrid varieties(IJHs)were transplanted by machine with three N rates(N0,N150 and N300,0,150 and 300 kg ha–1,respectively).Lodging-related physical parameters,morphological characteristics and apparent transport rates of dry matter were examined.Significant difference in yield was observed among different types of rice,and followed by IJs<HIs<IJHs.The average lodging index(LI)of hybrid varieties(HIs and IJHs)was higher than that of the inbred varieties(IJs)with higher plant height;moreover,lower apparent export rate of dry matter resulted lower LI in IJHs than in HIs.The HIs had a large difference in the LI,which came from the difference in bending stress(BS)induced by the difference in the apparent export rate of dry matter,varieties with lower leaf angle of upper three leaves possess strong lodging resistance capacity;however,the gap among the IJs was due to the difference in the cross section modulus(Z).The LI in the IJs or IJHs increased slightly with the increased N application,and there was no lodging incidence under the high N level,which was due to the low leaf angle and barely changed under high N;there was a significant interaction between varieties(HIs)and N rates in lodging rate and LI,varieties with lower leaf angle of upper three leaves were resistant to high N.These results suggest that compact plant type rice has higher lodging and N resistance at machine-transplanting method.

关 键 词：machine transplanted rice lodging resistance nitrogen apparent export rate of dry matter 

分 类 号：S511[农业科学—作物学]