Different Forms of Potassium and Their Contributions Toward Potassium Uptake Under Ginger (zingiber Officinale Roscoe) Production in an Ultisol of Umudike, Southeastern Nigeria

To identify the quantity of optimal rates of zinc fertilizer needed for maximizing Vigna radiata yield, a greenhouse and field studies were conducted in two cropping seasons. For the greenhouse, zinc sulphate was applied at five dosages (0, 5, 15, and 20 kg ha-1) and at seven dosages (0, 3, 6, 9, 12, 15, and 18 kg ha-1) for field study. The sandy loam (SL) soil samples had modest levels of OC (1.08 gkg-1) and ECEC (4.38 cmol kg-1) and were very strongly acidic (4.73). Using DTPA, EDTA, NH4OAc, and HCl methods, the accessible zinc in the soils had mean values of 1.03, 1.65, 1.23, and 2.17 mgkg-1, respectively. Using Cate-Nelson graphical and statistical models, the responses of the mungbean yield components to the Zn test values in the soil were established. In order to get the highest possible mungbean production in the Typic Paleudult, appropriate critical Zn levels were determined. Zn levels considerably raised the mungbean grain yields, Zn uptake, and Zn soil budget. Both the greenhouse and field studies, maximum utilization (1.27 mgplant-1) and grain yields (9.93 kgha-1) of mungbean were estimated at 13.01 and 12.53 kg Zn ha-1, respectively.