Food Crops
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Browsing Food Crops by Subject "Acid soils"
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Item Fertilizer Requirements of Yam (Dioscorea Rotundata) In Nsukka Acid Sandy Soils(1978) Ekpete, D.M.Nitrogen, Phosphorus and Potassium were applied to yam in 33 field trials on three soil types in Nsukka over two years. Quadratic response surfaces were fitted to the tuber yield data and where appropriate optimum and economic levels of the nutrients were estimated Ln the sandy clay loam there were positive responses only to nitrogen 'but in the loamy sand responses to .all the nutrients were obtained. The requirements of the three nutrients in the loamy sand for most economic returns were 49 kg N, 115 kg P20 S and 38 kg K20 per hectare resulting to a fertilizer recommendation on for yam of 10: 25 : 8 at 500 kg per hectare.Item Manure and Fertiliser Requirements of Potatoes on Acid Soils(1979) Susan M. M.3²' confounded factorial trial was laid down at Gituamba Substation, altitude 2,130 m, in the Long Rains 1979 in order to determine manure and fertilizer requirements of potatoes on acid soils. Nitrogen at 50, 100 and 150 kg/ha N as calcium nitrate, phosphate at 100, 200 and 300 kg I ha P205 as single superphosphate, potash at 0, 100 and 200 kg/ha K2O as sulphate of potash and farmyard manure at 0, 5 and 10 t/ha dry matter were applied at planting in the presence of a blanket dressing of 1 that lime in the form of Magmax. In the first season the total yield of potatoes was equivalent to 17.27 t/ha and only manure had a significant effect on yield, mean plot yields at 0, 5 and 10 t/ha being equivalent ,to 13, 20 and 21 t/ha. In the Short Rains 1979 a residual maize crop which yielded the equivalent of 3.6 t/ha showed significant effects of manure, potash and phosphate in descending order. Potatoes replanted in the Long Rains 1980 with reapplication of all treatments gave a total yield equivalent to 16.22 t/ha. Manure and potash had significant main effects on yield and there was a significant positive KF interaction. The treatments increased available nutrients in the soil and uptake of nutrients by the plants. The results showed that farmyard manure is the best treatment for potatoes grown on acid soils but may be supplemented by mineral fertilizers where insufficient amounts are available.Item Soil Silica and Phosphorus Response by Maize In Acid East African Soils(1970) Gaberg, P. K.Birch found significant and inverse relationships between percentage responses to phosphorus fertilizer and the amount of water or citric soluble silica in acid East African soils [1], for wheat and grassland crops Researches reported by other workers [e.g. 1, 2, 3, 4, 5, 6] show that there exists a dynamic interaction Between silicon, iron and aluminium with phosphate ions in the soil, leading to a variable degree of fixation; the extent and reversibility of this interaction is pH dependent. It is generally held that a high degree of phosphate ion fixation in acid soils by iron and/ or aluminium tends to mask expected crop responses to applied phosphorus. More recently, work has been published which suggests that the ph03- phate ion fixation may need to be saturated by fertilizer application to a lesser or greater degree, before crop responses can be predicted or observed with accuracy [7, 8].
