Relationship of soil potassium forms with maize potassium contents in soils derived from different parent materials

Italian Journal of Agronomy

Zahoor Ahmad¹  Abdul Qayyum²  Ayaz Mehmood²  Kashif Sarfraz Abbasi³  Rashid Mehmood Butt⁴  Mohammad Saleem Akhtar⁴  Muhammad Imran⁴  Shah Rukh⁴  Ghashiya Sattar Kayani⁴  Muhammad Tariq Siddique⁴ 

[1] Department of Agricultural Sciences, University of Haripur, Haripur, Pakistan;Department of Agricultural Sciences, University of Haripur, Haripur;Department of Food Technology,Pir Mehr Ali Shah-Arid Agriculture University, Rawalpindi;Department of Soil Science & SWC, Pir Mehr Ali Shah-Arid Agriculture University, Rawalpindi;

关键词: Potassium forms;    Potassium availability;    Parent material;    Soil genesis;    Maize;   

DOI  :  10.4081/ija.2017.818

来源: DOAJ

【 摘 要 】

Understanding of soil potassium (K) dynamics is essential for sustainable crop production. Bioavailability of K depends on forms and distribution within the soil profile. The objectives of this research were to determine which soil K forms control the maize (Zea mays) K contents and compare the extracting capability of sodium tetraphenylborate (NaTPB) with ammonium acetate (NH4OAc) method. Nine soils representing three different parent materials, i.e. loess, sandstone and shale were sampled at three surface genetic horizons. Within each parent material, three soils at varying level of development were selected. Besides basic soil parameters, K was fractioned into water soluble K, exchangeable K, non-exchangeable K, and NaTPB-extracted K. The maize was sown in pots having 2 kg soil from each genetic horizon. Crop was harvested at seven weeks and plant was analysed for K contents. Results show that NaTPB-extracted K gave best correlation as compared to NH4OAc method. This conveys that a non-exchangeable K portion that becomes available to plants can be better estimated by NaTPB method than NH4OAc extraction.

【 授权许可】

Unknown