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    Potassium balance as influenced by farmyard manure application under continuous soybean–wheat cropping system in a Typic Haplaquept

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    Authors
    Bhattacharyya, Ranjan
    Prakash, Ved
    Kundu, S.
    Ghosh, B.N.
    Srivastva, A.K.
    Gupta, H.S.
    Issue Date
    2006
    
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    Abstract
    The effect of 30 years of continuous cropping, fertilization and manuring on the potassium (K) balances, the soil K pools and the nonexchangeable K release in a Typic Haplaquept soil from Almora, India under a rainfed soybean–wheat cropping system were investigated. The apparent K balance was measured as the difference between the total K added and that removed by the crops. The results showed that the total removal of K by the crops exceeded the amount of total K applied to the soil in all the treatments showing a net negative K balance. This ranged from 3.7 in the plots under NK to 81.7 kg ha−1 year−1 in the N+FYM treated plots. Continuous annual application of recommended doses of NPK+10 t FYM (NPK+FYM) to soybean resulted in an accumulation (+56 kg K ha−1) of exchangeable K (1 N NH4OAc extractable K) in the 0–45 cm soil depth over the study period, despite the highest average annual uptake of K by the system (150.8 kg ha−1 year−1). However, there was a net depletion of exchangeable K (−80 kg K ha−1) in that soil depth under the NPK treated plots. The results also revealed that the content of non-exchangeable K decreased substantially from 3482 kg ha−1 to 2677 and 2896 kg ha−1 in the 0–45 cm soil layer after 30 years of cropping in the plots under NPK+FYM and NPK treatments, respectively. There was a significant decline in total soil K with the removal of non-exchangeable soil K in the surface (0–15 cm) soil layer (R2=0.526,Pb0.001, n=36). Thus, long-term application of non-revised recommended fertilizer rates may threaten sustainability of the rainfed continuous soybean–wheat system.
    Citation
    Geoderma, 137(1-2): 155–160
    Publisher
    Elsevier
    URI
    http://hdl.handle.net/2436/15831
    DOI
    10.1016/j.geoderma.2006.08.006
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0016706106002424?via%3Dihub
    Type
    Journal article
    Language
    en
    Description
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    ae974a485f413a2113503eed53cd6c53
    10.1016/j.geoderma.2006.08.006
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