Soils, crop nutrient status and nutrient dynamics on small-holder farms in central Tibet, China

Nicholas Paltridge, S Grover, L Gouyi, Jin Tao, Murray Unkovich, Nyima Tashi, David Coventry

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    Little is known about the soils that support agriculture in Tibet. The aim of this paper is to investigate the physical and chemical properties of Tibet's agricultural soils, the nutritional status of wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.) crops, and the sustainability of current soil management practices. Physical descriptions of Tibet's agricultural soils were based on soil pits dug at three locations across Tibet's agricultural zone. Chemical analyses were conducted on soils from seven sites across the zone. Nutritional constraints to agriculture were identified through leaf tissue tests on wheat and barley crops from 23 fields. These results, combined with published information on farm inputs and yields, provided insight into the sustainability of current nutrient practice. Soils were found to be silty or sandy clay loams with alkaline reaction, low organic content and low K and Zn status. Leaf analysis revealed one third to one half of cereal crops were marginal or deficient for K, Zn and Mg. Most farmers export grain and import only nitrogenous and phosphatic fertilizers leading to a nutrient imbalance. A balanced fertilizer program is required to halt nutrient depletion and increase grain production. Reduced tillage and crop residue retention are needed to improve soil health.

    Original languageEnglish
    Pages (from-to)219-229
    Number of pages11
    JournalPlant and Soil
    Volume348
    Issue number1-2
    DOIs
    Publication statusPublished - Nov 2011

    Keywords

    • Agriculture
    • Barley
    • Magnesium
    • Potassium
    • Wheat
    • Zinc

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