N. Okoli, C. Echereobia, C. Ahukaemere, Chinonoso Chris-Emenyonu, Nnebue Obinna, A. Osisi, E. Chukwu, N. Egboka
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Chemical fractionation and bioavailability of potassium as affected by digestate in a degraded Ultisol under maize cultivation
ABSTRACT Application of soil amendment enhances redistribution of potassium (K) forms which affects K availability. Information on the effect of soil amendment on soil K dynamics is vital for management of soil K. The effects of digestate on dynamics of water soluble (WS), exchangeable K (Exch), non-exchangeable (Non-Ex) and mineral (Min) K fractions as well as maize growth and potassium uptake were investigated under a factorial experiment arranged in a completely randomized design of 5 (0, 5, 10, 15, 20 t ha−1 digestate) × 3 (2, 4, 6 weeks after planting (WAP) ×2 (two growth cycles of maize). During incubation experiment, digestate application increased K fractions and altered the order of distribution of K fractions from Min > Exch > non-Ex > WS in the control soil to Min > WS > Non-Ex > Exch in the amended soil. Potassium availability increased with WAP in first cycle but decreased with WAP in second cycle due to crop uptake. Potassium uptake and dry matter yield were better in first cycle relative to second cycle. Complementing digestate with mineral fertilizer would improve K uptake and maize growth.
期刊介绍:
rchives of Agronomy and Soil Science is a well-established journal that has been in publication for over fifty years. The Journal publishes papers over the entire range of agronomy and soil science. Manuscripts involved in developing and testing hypotheses to understand casual relationships in the following areas:
plant nutrition
fertilizers
manure
soil tillage
soil biotechnology and ecophysiology
amelioration
irrigation and drainage
plant production on arable and grass land
agroclimatology
landscape formation and environmental management in rural regions
management of natural and created wetland ecosystems
bio-geochemical processes
soil-plant-microbe interactions and rhizosphere processes
soil morphology, classification, monitoring, heterogeneity and scales
reuse of waste waters and biosolids of agri-industrial origin in soil are especially encouraged.
As well as original contributions, the Journal also publishes current reviews.