Nutrient Absorption and Nutrient Balance in an Agro-pastoral Compound Production Pattern of “Raising Geese in Corn Fields” in Tibet
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Supported by the Science and Technology Service Network Initiative of the Chinese Academy of Sciences (No. KFJ-EW-STS-073), Tibet Provincial Department of Science and Technology, the Development Platform of Wild Characteristic Biological Resources in Tibet

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    Abstract:

    Facing a rapidly growing population, Tibet has to improve its agricultural productivity so as to provide sufficient food. To improve agricultural production and enhance crops yields, farmers have increased the use of fertilizers. However, the Tibetan plateau environment is so sensitive and fragile that any increased usage of these chemicals may put the plateau environment at risk of agricultural non-point source pollution. How to harmonize economic benefits with ecological ones is a significant challenge to development of Tibetan agriculture. Nutrient absorption and nutrient balance of a farmland ecosystem is one of the key factors affect productivity and environmental quality of the system. Raising Geese in Corn Fields (hereinafter referred to as RGICF) is a compound production pattern based on the principle of “Agro-pastoral Integration”, a concept proposed in 2011. This conceptual farming method relies on the use of weeds and bottom leaves of the crops in the fields as feed sources to raise poultry with. To evaluate differences between the two systems of RGICF and conventional corn cultivation in nutrient absorption, nutrient balance, nutrient distribution in the plant, and nutrient input and output of the system, a field experiment was conducted at Village Zhangmai of Bayi, Tibetan Autonomous Region, in Southwest China 2013. Two treatments, RGICF and conventional corn cultivation (hereinafter referred to as CK), were laid out in the experimental field. Each treatment was designed to have three blocks or plots, and each plot covered an area of 80 m-2. Logs were kept of RGICF and CK from May 2013 to May 2014 about nutrient inputs and outputs, while chemical analysis were conducted of samples of the corn for nutrient (N, P and K) concentration and distribution in stalks and grains, and samples of the soil, too, for nutrient budgeting. Results show that no significant differences were found between RGICF and CK in N, P and K concentration in corn grains and stalks. Correlation between nutrient adsorption and corn yield exhibited and order of P>K>N in RGICF and P>N>K. No significant differences were found either between RGICF and CK in nutrient harvest, adsorption efficiency and utilization efficiency of N, P and K. Nutrient budgeting of the systems revealed nutrient disbalance in the systems, particularly N and K deficits in the soil after harvest. Compared with RGICF, CK was 39.0% and 34.90% greater in N and K deficit. The differences were significant (p<0.05). However, the deficit of P was relatively small in CK, while it turned into P surplus in RGICF, showing extremely significant difference (p<0.01). In the aspect of economic benefit, though RGICF suffered certain loss (6.22%) in corn yield, the was compensated or even over-compensated by geese raising, making RGCIF much higher in economic benefit than CK of avoiding the application of herbicides, used in CK fields. In all, RGICF does not have much influence on nutrient adsorption and utilization, but improves somewhat soil nutrient balance and yields higher economic benefit. Therefore, it can be concluded that RGICF can be extrapolated as an important production pattern for sustainable agriculture in the future in Tibet.

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SHA Zhipeng, ZHANG Yuyang, WANG Chao, QUAN Hong, GUAN Fachun. Nutrient Absorption and Nutrient Balance in an Agro-pastoral Compound Production Pattern of “Raising Geese in Corn Fields” in Tibet[J]. Acta Pedologica Sinica,2016,53(2):523-532.

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History
  • Received:June 10,2015
  • Revised:November 20,2015
  • Adopted:December 08,2015
  • Online: December 15,2015
  • Published: