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 l...