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| Influence of dripper discharge on cotton root distribution and water consumption under pot cultivation |
| Sun Hao1,2, Li Mingsi3, Li Jinshan1,2, Han Qibiao1,2, Feng Junjie1,2, Jia Yanhui1,2 |
| 1.Farmland Irrigation Research Institute, The Chinese Academy of Agricultural Sciences, Xinxiang, Henan 453002, China; 2.Key Laboratory of Water-saving Agriculture of Henan Province, Xinxiang, Henan 453002, China; 3.College of Water Conservancy and Architecture Engineering, Shihezi University, Shihezi, Xinjiang 832003, China |
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Abstract Taking cotton as subject, cotton root distribution and water consumption were measured at each growth stage under five different dripper discharge(0.5,1.0,1.5,2.0,2.5 L/h). The results show that in the soil depth direction, cotton root length didnot concentrate in the surface layer, but 10-30 cm under soil surface, and with dripper discharge increasing, the mostly concentrated place of root length transferred to shallow soil layer. The vertical distribution of cotton root weight could be described as the negative exponential function of soil depth, the largest root weight was observed in soil surface layer, and the ratio of deep root weight declined with the dripper discharge increasing. On the horizontal direction, the cotton root length and root weight all reduced gradually from the cotton stem to both sides of it, and with dripper discharge increasing, the ratio of root length(or root weight density)below the cotton stem decreased, but the ratio of root length(or root weight density)in both sides increased, cotton root changed from compact structure to extended structure. The field water consumption of cotton in the whole growth period showed as bimodal type curve, but with dripper discharge increasing, water consumption intensity at seedling stage increased, the moment of water consumption depth moving down delayed, and the highest water consumption period postponed.
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Received: 17 January 2014
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