Complementary nutrient effects of kraal manure and inorganic fertilizer on lettuce (lactucasativ al.) and maize (zeamays l.) grown under glasshouse conditiqns
2005
Mnkeni, P.N.S.(Unversity of Fort Hare, Faculty of Agriculture and Environment scieces, Directorate of Agronomy, south Africa) | Mtshizana, T.D.(Unversity of Fort Hare, Faculty of Agriculture and Environment scieces, Directorate of Agronomy, south Africa) | Brutsch, M.O.(Unversity of Fort Hare, Faculty of Agriculture and Environment scieces, Directorate of Agronomy, south Africa) | Mdana, S.(Unversity of Fort Hare, Faculty of Agriculture and Environment scieces, Directorate of Agronomy, south Africa)
This glasshouse study was conducted to evaluate the complementary nutrient effects of kraal manure and inorganic fertilizer on lettuce (Lactuca sativa L.) and a rubsequentresidual crop of maize (Zea mays L.), Treatments consisted of a control and wmbinations of kraal manure and inorganic fertilizer applied to a Typic Plinthustalf to mpply 200 kg N ha-I. The inorganic fertilizers used were NPK (2:3 :2(22) and Urea (46 % N) whilst kraal manure was either of cattle or sheep origin. Dry matter ~elds showed that the inorganic fertilizer tteatments resulted in the highest yields. Urea, however, produced lower yields relative to NPK fertilizer possibly because urea contributed no P or K to the, soil. Nitrogen uptake and recovery was, however, !reater with urea than with NPK tteatments. Combinations of cattle or sheep haal manure contributing 25% or. 50% of fueN produced yields comparable to those obtained with inorganic fertilizer suggesting that kraal manure could be used to meet up 1050% of the N requirement of the test crops without yield being significantly compromised. Key Words: South Africa, Nutrients, sheep and cattle kraal manure, inorganic fertilizers, lettuce, maize
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