|Table of Contents|

Effect of Planting Density on Characteristics of Soybean Cultivars with Different Density Tolerance(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2015年02期
Page:
255-259
Research Field:
Publishing date:

Info

Title:
Effect of Planting Density on Characteristics of Soybean Cultivars with Different Density Tolerance
Author(s):
ZHENG Wei1;  XIE Fu-ti2;  GUO Tai1;  WANG Zhi-xin1;  LI Can-dong1;  ZHANG Zhen-yu1;  ZHANG Mao-ming1;  LIU Zhong-tang1
1.Jiamusi Branch of Heilongjiang Academy of Agricultural Sciences, Jiamusi 157007, China；?
2.Agronomy College, Shenyang Agricultural University, Shenyang 110866, China
Keywords:
Soybean;  Planting density;  Photosynthetic characteristics;  Water use efficiency;  Yield
PACS:
S565.1
DOI:
10.11861/j.issn.1000-9841.2015.02.0255
Abstract:
Two different planting density tolerance soybean varieties and three densities of 225 000, 300 000 and 375 000 plants?ha-1?were set to study the effect of planting density on soybean characteristics.Results showed that as the density increased, the upside canopy petiole length of close planting resistant variety Kenfeng 16 was significantly lower than the common variety Hefeng 25. In the high density condition, petiole length of Kenfeng 16 was shorter than Hefeng 25 from the 9th?node.The leaf shape index of Kenfeng 16 was higher than the common variety, especially under the high density from the 12th?node, which was significant or very significant higher than the common variety Hefeng 25 and advantageous to get air and light. The SPAD readings of close planting resistant variety of Kenfeng 16 were higher than the common variety.As the density increased, the SPAD readings peak times of Kenfeng 16 did not change significantly. In the late growth stage and high density, Kenfeng 16 could stay green stronger. As the density increased, the net photosynthetic rate and water use efficiency reduced slowly in the close planting resistant variety Kenfeng 16.The net photosynthetic rate and water use efficiency difference between Kenfeng 16 and Hefeng 25 reached significant level in 300 000 plants?ha-1?(P=0.033 3, P=0.023 5, respectively), and reached very significant level in 375 000 plants?ha-1?(P=0.001 8, P=0.004 7, respectively) As the density increased, the yield of close planting resistant variety Kenfeng 16 increased gradually, but the yield of close planting non-resistant variety Hefeng 25 increased first and then decreased.The yield difference between Kenfeng 16 and Hefeng 25 reached very significant level (P=0.001 9) in the density 375 000 plants?hm2.?From the changes of plant morphological and photosynthetic physiological indexes between Kenfeng 16 and Hefeng 25 under different density conditions can be seen that the canopy structure of close planting resistant varieties Kenfeng 16 was more conducive to get air and light in high density conditions, could stay green stronger in the late stage of close planting, little effects of density on the photosynthetic rate and water use efficiency.So Kenfeng 16 can obtain higher yield in higher density condition.

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Last Update: 2015-06-07