Effect of Irrigation and Phosphorus Supply on Dynamic Changes of Soil Moisture Under Alfalfa Plant and Root Weight of Alfalfa

HUO Hai-li; WANG Qi; ZHANG En-he; SHI Shang-li; WAND Tian-tao; LIU Qing-lin

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Effect of Irrigation and Phosphorus Supply on Dynamic Changes of Soil Moisture Under Alfalfa Plant and Root Weight of Alfalfa

- Effect of Irrigation and Phosphorus Supply on Dynamic Changes of Soil Moisture Under Alfalfa Plant and Root Weight of Alfalfa
- Bulletin of Soiland Water Conservation Vol. 32, Issue 4, Pages: 159-165(2013)
- 作者机构：
  
  1. 甘肃农业大学草业学院,甘肃,兰州,730070
  2. 甘肃农业大学农学院,甘肃,兰州,730070
- 作者简介：
- 基金信息：
- DOI：
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- Published：2013
- 稿件说明：
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HUO Hai-li, WANG Qi, ZHANG En-he, et al. Effect of Irrigation and Phosphorus Supply on Dynamic Changes of Soil Moisture Under Alfalfa Plant and Root Weight of Alfalfa[J]. Bulletin of Soiland Water Conservation, 2013, 32(4): 159-165.
DOI：

HUO Hai-li, WANG Qi, ZHANG En-he, et al. Effect of Irrigation and Phosphorus Supply on Dynamic Changes of Soil Moisture Under Alfalfa Plant and Root Weight of Alfalfa[J]. Bulletin of Soiland Water Conservation, 2013, 32(4): 159-165. DOI：

摘要

采用完全随机裂区设计

常规灌溉量(330mm)

节水20%灌溉量(264mm)和节水40%灌溉量(198mm)作为主处理

施磷量(0

120和180kg/hm

)作为副处理

研究了不同灌溉量和施磷量对紫花苜蓿土壤贮水量、耗水强度、水分利用效率和根重的影响。结果表明

土壤贮水量、紫花苜蓿耗水强度和根重随灌溉量增加而增加

水分利用效率随灌溉量增加而降低。施磷对紫花苜蓿土壤贮水量和耗水强度影响不明显。紫花苜蓿水分利用效率和深度0-40cm根重随施磷量的增加表现为先增加后降低

当施磷量达到120kg/hm

时

紫花苜蓿水分利用效率﹝26.50kg/(mm·hm

)﹞和全生育期平均根重(1 320.78g/m

)达到最大值。

Abstract

According to the complete random split spot design

the effects of different irrigation water amount and phosphorous supply on the water srtorage

water consumption rate

water utilization efficiency(WUE) of soil under alfalfa

and root weight of alfalfa were analysed taking irrigation water(330mm of normal irrigation

164mm of 20%saved irrigation and 198mm of 40%saved irrigation)as the main factors and phosphorus supply(0

120and 180kg/hm2)as the cofactor.It was indicated that the soil water storage

the water consuming capacity and root weight of alfalfa increased with the irrigation water increasing while the water utilization efficiency decreased with it.Phosphorus supply did not significantly affect soil water storage and water consumption rate.The WUE and dry root weights of alfalfa at 0-40cm depth increased with P supplies'increasing at first

and decreased later while the WUE and the whole life dry root weight reached its maximum value at 26.50kg/(mm·hm2)and 1 320.78g/m2 when the phosphorous application rate was 120kg/hm2.

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