Effects of N Application at Later Stage on Absorbability of Rice Root in Cold Area
Year: 2011
Type: article
Abstract: A plot experiment with different N rates(135 kg/hm2 and 105 kg/ hm2) was designed to study the effects of panicle N fertilizer ratio on absorbability of rice root in cold area.The results showed that the root bleeding and soluble sugar content of root in the 15% panicle N under high N level(135 kg/ hm2) was lower and in the treatment of 35% under middle N level(105 kg/ hm2) was higher at each period.Under the same N level,compared with 15% panicle fertilizer,the root bleeding of 35% panicle fertilizer were significantly increased at panicle initiation.At the same time,the soluble sugar content of rice root at panicle initiation stage and 20 days after heading were improved by 14.0% and 35.1%(p0.05) respectively.Compared with 15% panicle fertilizer treatment,35% panicle fertilizer treatment significantly increased total N uptake rate,N recovery efficiency,agronomic efficiency and partial factor productivity by 11.1%-15.6%,20%-43%,37.5%-38.5% and 12.6%-20.8%(p0.05),respectively,and increased average yield by 12.3%-12.7%(p0.05) as well.The results suggested that the increase of soluble sugar rate of rice root and root bleeding improved N uptake and N use efficiency by improving the concert of rice root C and N metabolism.
Source: Soils
Author: Li-Nan Chen
Institution: Northeast Agricultural University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W2388901273