摘要
以杂交粳稻常优1号为材料,设置25.05、50.10和75.15万株·hm^(-2) 3个基本苗数,进行机插秧新生分蘖跟踪挂牌,研究各级分蘖的发生率及成穗率特征。结果表明:机插杂交粳稻栽插50.10万株·hm^(-2)基本苗时群体有效穗数最多,产量最高;机插杂交粳稻分蘖发生和成穗主要集中在2/0、3/0、4/0、5/0和6/0的一级分蘖及1/2、1/3和1/4的二级分蘖;随着基本苗数增加,分蘖发生数减少,最终成穗数也减少,同时高位分蘖对产量的贡献也减少,单茎重、各蘖位的每穗粒数和占最终穗数的比例均减小。机插杂交粳稻移栽时以50.10万株·hm^(-2)基本苗为宜,过多或过少都影响机插杂交粳稻分蘖发生、蘖位利用和成穗数。
Hybrid japonica rice Changyou 1 was machine-transplanted in three basic seedlings density,250 500,501 000 and 751 500 seedlings per hm^2.The tiller emerging rate and tiller earbearing rate were investigated.Results showed that colony of 501 000 seedlings per hm^2 had the highest effective panicle number and produced the highest grain yield.Most of tillers emerged and earbeared from 2/0,3/0,4/0,5/0,and 6/0 primarily and 1/2,1/3,and 1/4 secondary.With the increasing of basic seedling density,the number of tiller emerging and tiller earbearing decreased.And the upper position tillers had lower dry weight per stem,spikelet number per panicle and tiller earbearing rate,thus having less contribution to grain yield.This research indicated that seedling density has substantial influence on the tiller emerging and earbearing,and suggested that 501 000 seedlings per hm^2 was the optimal planting number for machine-transplanted hybrid japonica rice.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
2010年第1期6-10,共5页
Journal of Nanjing Agricultural University
基金
国家科技支撑计划项目(2006BAD02A03
2008BAD96B05)
国家科技计划重点项目(2007EA690004)
江苏省科技招标项目(BE2007307)
关键词
杂交粳稻
机插秧
分蘖发生率
分蘖成穗率
产量
hybrid japonica rice
machine-transplanted rice
tiller emerging rate
tiller earbearing rate
yield
