Volume 3, Issue 3, June 2015, Page: 117-122
Sustaining Improved Cassava Production on West African Ferralsols Through Appropriate Varieties and Optimal Potassium Fertilization Schemes
Jean Mianikpo Sogbedji, School of Agronomy, University of Lome, Lome, Togo
Lakpo Kokou Agboyi, Togolese Institute of Agronomic Research, Lome, Togo
Kodjovi Sotomè Detchinli, School of Agronomy, University of Lome, Lome, Togo
Ruth Atchoglo, School of Agronomy, University of Lome, Lome, Togo
Mihikouwe Mazinagou, School of Agronomy, University of Lome, Lome, Togo
Received: Apr. 3, 2015;       Accepted: Apr. 16, 2015;       Published: Apr. 24, 2015
DOI: 10.11648/j.jps.20150303.12      View  4894      Downloads  172
Abstract
Improved nutrient use efficiency and use of appropriate crop varieties are required towards producing enough food in a sustainable manner. This study assessed the response of three cassava (Manihot esculenta Crantz) varieties to three potassium (K) fertilization rates on West African ferralsols. It aimed at identifying optimal K fertilizer application rates and corresponding appropriate crop varieties for improved and sustainable cassava production. Three K fertilizer rates including 0, 50 and 100 kg K ha-1 were used together with fertilizers nitrogen (N) and phosphorus (P) each at a fixed rate of 60 kg ha-1. The cassava varieties were Gbazekoute (V1), KH (V2) and Moya (V3). Field data including cassava fresh tuber and stover yields, and harvest index (HI) were collected from the 2-yr experiment in which treatments were arranged in a split-plot design, with varieties as main plots and K fertilizer rate as subplots. Mean fresh tuber yield under Gbazekoute (65.5 Mg ha-1) increased by 68.4 and 44.3% as compared with KH (38.9 Mg ha-1) and Moya (45.4 Mg ha-1), respectively, while yield under Moya was superior to that of KH by 16.7%, indicating that tuber yield potential was highest, intermediate and lowest for V1, V3 and V2, respectively. Mean stover yield under Gbazekoute (52.2 Mg ha-1) decreased by 12.6 and 18.7% as compared with KH (59.7 Mg ha-1) and Moya (64.2 Mg ha-1), respectively. Mean harvest index values increased under Gbazekoute (55.7%) by 41 and 34.5 % as compared with KH (39.5%) and Moya (41.4%), respectively, and value under KH was 4.6% lower than that for Moya. The three varieties were responsive to applied fertilizer K rate with the response being highest, intermediate and lowest for the KH, Moya and Gbazekoute, respectively. For the three varieties, the optimum K fertilizer application rate was 50 kg K ha-1. Gbazekoute proved superior over KH and Moya in efficiently allocating assimilates to storage roots at the expenses of the stover. The use of 50 kg K ha-1 together with 60 kg N ha-1 and 60 kg P ha-1 (N60P60K50 kg ha-1) under the Gbazekoute may be a recommended practice towards sustaining improved cassava production on the inherently degraded West African ferralsols.
Keywords
Cassava Variety, Ferralsols, Fertilizer Potassium, Yield, Harvest Index
To cite this article
Jean Mianikpo Sogbedji, Lakpo Kokou Agboyi, Kodjovi Sotomè Detchinli, Ruth Atchoglo, Mihikouwe Mazinagou, Sustaining Improved Cassava Production on West African Ferralsols Through Appropriate Varieties and Optimal Potassium Fertilization Schemes, Journal of Plant Sciences. Vol. 3, No. 3, 2015, pp. 117-122. doi: 10.11648/j.jps.20150303.12
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