| || || Kumar, Nand.|
| || || Response of two cultivars of taro [Colocasia esculenta (L.) Schott] to residual potassium and poultry manure on Tokotoko soil series (Aquept) in Fiji |
Institution: University of the South Pacific.
Subject: Taro -- Research -- Fiji, Taro -- Fertilizers -- Fiji, Taro -- Fiji -- Growth
Call No.: pac SB 211 .T2 K85 2000
Copyright:10-20% of this thesis may be copied without the authors written permission
Abstract: This experiment has demonstrated various aspects of responses of two cultivars of taro grown on flat lands utilising residual potassium (K) and poultry manure (PM) after a ginger trial on Tokotoko soils. It showed that taro can be grown on poorly drained under-utilised soils previously grown to wetland rice, through improved drainage by use of raised beds. Taro can also be grown on flat lands as part of a ginger based farming system utilising residual fertilizers. The growth and development pattern of the two cultivars used in the experiment varied in terms of root distribution, nutrient uptake, corm yield, leaf and sucker numbers, petiole length, leaf area and time to maturity. This experiment also showed that there were significant responses to previous ginger experiment with application of K and PM. Appreciable amounts of the nutrients (N) phoshporus (P) K, and micronutrients calcium (Ca), magnesium (Mg), sulphur (S), sodium (Na), manganese (Mn), iron (Fe), and zinc (Zn) remained in the soil due to use of PM and influenced the subsequent taro crop. The use of flat lands does not have erosion problem similar to that for ginger grown on sloping lands. It also helped in reduction of labor costs due to mechanisation. This experiment showed that fertiliser application can be reduced in the subsequent crop by about two-thirds, but the exact amount of nutrients can be determined based on soil analyses results. Other findings showed that addition of K and PM helped in improving soil pH, bases, rooting, suckering, yield and supplying macro and micro-nutrients. The cv. Vula Ono requires higher levels of Ca and higher soil pH, nutrient requirement including N varied with growth stage and taro cultivar. Soil residual levels of K were not sufficient at harvest. The nutrient uptake for Vula Ono was higher than that for Tausala-ni-Samoa. Poultry Manure also improved physical properties of the soil. It helped in improving P availability significantly. Potassium helped in improving exchangeable bases and carbon.