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- Title
Effects of N and S application on grain filling characteristics and yield of winter wheat.
- Authors
ZHAO Yu-xia; LI Na; ZHOU Fang; LI Xue-fang; WANG Lin-quan
- Abstract
A field experiment was conducted on the Guanzhong Plain, China, to evaluate the effects of N and S application on characteristics of winter wheat (cv. Xiaoyan 22) grain filling and yield, using a central composite rotatable design with two factors nitrogen (N) and sulfur (S). The results showed that, with the combined application of N and S, grain filling followed a "S" curve which increased slowly at first, then quickly, and then slowly again. With 108 and 267 kg N·hm-2, the grain fill duration, theoretical maximum grain yield, and average filling rate decreased as the S application rate increased. With 97. 5 and 202. 5 kg S·hm-2, N application improved grain filling parameter values. With 187. 5 kg N·hm-2 or 150 kg S·hm-2, the parameters firstly increased, reached a maximum, and then decreased as the S or N input increased. Grain filling rate increased for 25 days following anthesis, and then declined at a rate that varied among treatments. When the N input was >187. 5 kg·hm-2 or the S input was >150 kg·hm-2, the grain filling rate decreased with increasing the S or N input. The results also indicated that combined application of N and S fertilizers at appropriate rates could increase the head density and grain yield. Using the regression equations, highest grain yields estimates (≥3753 kg·hm-2 ) were achieved with the combination of a high N rate ( 178. 31 - 256. 36 kg · hm-2 ) and a moderate S rate (131. 95-167. 65 kg·hm-2).
- Subjects
WINTER wheat; GRAIN growth; GRAIN yields; EFFECT of fertilizers on plants; NITROGEN fertilizers; SULFUR fertilizers
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2014, Vol 25, Issue 5, p1366
- ISSN
1001-9332
- Publication type
Article