| 当年施肥对生土地棉花地上部生产力及根干物质质量垂直分布的影响 |
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| 摘 要： | 为探求生土地当年最佳施肥方式,快速提高棉花地上部生产力并改良根干物质质量垂直分布,试验连续2年以黄土母质生土为供试土壤,采用根管土柱法,研究不同肥料(N,P,NPK,有机肥,不施肥对照(CK))、不同施肥深度(0~20 cm,40~60 cm,80~100 cm土层)对棉花(Gossypium hirsutum)茎叶干物质质量、棉铃干物质质量及根干物质质量垂直分布的影响。结果表明,所有处理中,以有机肥深施40~60 cm处理的茎叶和棉铃的干物质质量最大,其次为NPK肥深施40~60 cm处理,二者差异显著(P0.05);以含P肥深施40~60 cm处理的根干物质质量较大,且40 cm以下根层的分布比例较大;所有处理均以0~20 cm层的根分布比例最大,约占0~100 cm总根干物质质量的40%~80%。总的来看,当年生土地棉花冠￣根系统的最佳肥料运筹是有机肥深施40~60 cm。
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Effects of Fertilization in Current Year on the Productivity and Vertical Distribution of Root Dry-matter Weight of Cotton in Immature Loess Subsoil |
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| Authors: | Su Zhifeng Yang Wenping Yang Zhenping Du Tianqing Hao Jiaomin Sun Min Gao Zhiqiang |
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| Institution: | 1. College of Agriculture, Shanxi Agricultural University, Taigu, Shanxi 030801, China; 2. College of life Science, Hebei United University, Tangshan, Hebei 063000, China; 3. College of Food Science and Engineering, Shanxi Agricultural University, Taigu, Shanxi 030801, China |
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| Abstract: | Immature loess subsoil was used to find the optimum fertilization regime to improve the productivity and vertical distribution of root dry-matter weight of cotton (Gossypium hirsutum) by soil column culture in root-tubes for two years. Four kinds of fertilizer (N, P, NPK, and organic fertilizer) and fertilization of three soil layers (at depths of 0-20 cm, 40-60 cm and 80-100 cm) were used to investigate the dry-matter weights of the stem-leaf and boll, and the vertical distribution of root dry-matter weight in cotton. The control treatment (CK) was without fertilization. The highest dry-matter weights for the stem-leaf and boll of cotton were observed under organic fertilizer at a 40-60 cm soil depth, followed by NPK fertilizer at a 40-60 cm soil depth, and there was a significant difference between them (P＜0.05). A higher root dry-matter weight in cotton was observed under P or NPK fertilizer at a 40-60 cm soil depth than under the other treatments, and the root dry-matter weight percentage below the 40 cm root layer was higher than in the other root layers. Among all treatments, the root dry-matter weight percentage in the 0-20 cm root layer was the highest, representing 40%-80% of the total (0-100 cm). Overall, using organic fertilizer at a 40-60 cm soil depth is the optimum fertilization method in current year for planting cotton in immature loess subsoil fields. |
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| Keywords: | fertilization immature loess subsoil cotton productivity root dry-matter weight vertical distribution |
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