PJB-2021-476
Long-term fertilization effects on organic carbon, aggregates, and L- and D-amino acids in soils under wheat and maize crops
Zarina Bibi, Weixin Ding, Naqib Ullah Khan, Ghulam Jilani, Muhammad Jamil Khan, Qudratullah Khan and Muti Ullah
Abstract
Soil organic carbon (SOC) plays a key role in maintaining soil quality and improving soil physical, chemical, and biological properties. Long-term organic and inorganic fertilization effects on SOC, soil aggregates, and L- and D-amino acids under wheat (Triticum aestivum L.) and maize (Zea mays L.) crops were studied at Fengqiu State Key Agroecological Station, Fengqiu County, China. Field studies were initiated in September 1989 and continued for 23 years until 2012. Compost manure and NPK fertilizers alone and in different combinations were applied to wheat and maize crops. Wheat and maize as test crops were grown during winter and summer cropping seasons, respectively. The field experiment included seven treatments i.e., a) compost (CM), b) combination of half compost plus half inorganic fertilizer N (HCM), c) inorganic NPK (nitrogen-phosphorus-potash) fertilizer, d) inorganic NP fertilizer, e) inorganic PK fertilizer, f) inorganic NK fertilizer, and g) no fertilizer (control) were applied in a randomized complete block design. The L- and D-amino acids concentrations were significantly enhanced in CM- and HCM-treated soils. Amino acids showed a positive response in organically fertilized soil. The L-aspartic, L-glutamic, and D-aspartic acids were significantly (p≤0.01) and positively associated with SOC content. Similarly, SOC content showed a significant positive correlation with L-alanine, L-lysine, L-phenyl-alanine, L-glutamine, and D-tryptophan acids. The D-tryptophan and D-aspartic acids showed a significant positive correlation with total nitrogen. Organic fertilizer alone and in combination with NPK fertilizers increased the amino acids which ultimately enhanced soil fertility by increasing SOC.
To Cite this article:
Bibi, Z., W. Ding, N.U. Khan, G. Jilani, M.J. Khan, Q. Khan and M. Ullah. 2022. Long-term fertilization effects on organic carbon, aggregates, and L- and D-amino acids in soils under wheat and maize crops. Pak. J. Bot., 54(6): DOI: http://dx.doi.org/10.30848/PJB2022-6(20)
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