|Table of Contents|

Effects of N and Density Interaction on Dry Matter Distribution in Canopies in Soybean(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2015年01期
Page:
46-51
Research Field:
Publishing date:

Info

Title:
Effects of N and Density Interaction on Dry Matter Distribution in Canopies in Soybean
Author(s):
WU Qiong;  SUN Lei;  LIU Yuan-ying;  ZHANG Ming-cong;  SUN Wen-xiang;  ZHAO Jing;  WANG Li-juan
College of Resources and Environmental Science, Northeast Agricultural University, Harbin 150030, China
Keywords:
Soybean;  N and density interaction; Canopy; Dry matter accumulation
PACS:
S565.1
DOI:
10.11861/j.issn.1000-9841.2015.01.0046
Abstract:
A split-plot designed field experiment with three densities (200 000, 250 000 and 300 000 plants?ha-1) and three N treatments (basal fertilizer N 60 kg?ha-1；N 18 kg?ha-1?as basal fertilizer plus N 42 kg?ha-1?as topdressing at stage R3/R4) using soybean cultivar Dongnong 52 was conducted to study the effects of starter-N plus top-dressing N on dry matter distribution in leaves, petioles and pods in different canopies under different densities. Results showed that dry matter weight of different organs in middle canopy increased with increment of density at stage R6. At stage R7, dry matter weight of different organs in upper/middle canopy under the density of 250 000 plants?ha-1?was significantly higher than the statistics for 300 000 plants?ha-1. Different organs dry matter weight in upper/middle canopy after R5 of starter-N plus top-dressing N were significantly higher than those of using N only as basal fertilizer under the same density. Besides, top-dressing N at stage R4 was better than at stage R3. At stage R8, seed dry matter weight in upper canopy of starter-N plus top-dressing N at R4 was 15.2% higher than using N only as basal fertilizer (P<0.05) under the density of 250 000 plants?ha-1. The number of ≤2-seeded pods in upper/middle canopy reached a maximum under the density of 300 000 plants?ha-1, while the best density for 3/4-seeded pods was 250 000 plants?ha-1; starter-N plus top-dressing N increased the number of 3/4-seeded pods. In summary, starter-N plus top-dressing N at R4 under the density of 250 000 plants?ha-1?increased the dry matter weight of organs in upper/middle canopy after R6 and the number of 3/4-seeded pods, and yield under this condition was 10.8%-36.5% higher- than other treatments (P<0.05).

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Last Update: 2015-04-12