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Effects of cocoa and coffee pods husks composts combined with NPK fertilizer on the growth of immature cocoa trees (Theobroma cacao linn.) on depleted soil in tropical zone

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Author: 
Ayi Koffi ADDEN, Kouami KOKOU and Gbénonchi MAWUSSI
Abstract: 

The fertility declining in tropical soils is a crucial problem for farmers, also agricultural practices aren’t favourable for nutriments exported return back in soil, especially in cocoa production lands in Togo. A composting trial of cocoa pods husks and coffee pods husks (CKKO and CKF) with manure (4:1) then a field experiment were carried out in order to elucidate the effects of these composts combined with fertilizer NPK15-15-15 on the immature cocoa trees and the soil chemical properties. The experiment lied out in split plot design with three repetitions. The treatments consisted with three amounts of composts in principal plots (0 kg.plant-1, 2 kg.plant-1 CKKO and 2 kg.plant-1 CKF) combined with three doses of NPK fertilizer in the sub-plots (0, 50 and 75 g.plant-1). The field maintenance was done regularly then the parameters of compost sanitation, agronomic variables and data on soil chemical properties were collected. The results showed that the composts produced in 60 days are usable with yields of 740±3.51 and 821±8.84 kg.tons-1 for CKKO and CKF respectively. Both fertilizers didn’t have an effect on cocoa trees lifting percentage, nor on their stem girth size. The CKKO and CKF generated respectively a cocoa trees height of 64±9.77 cm and 64.69±11.77 cm versus 52.5±13.68 cm for the control (p<0.05) whereas the mineral fertilizer gave 60.40±11.72 cm (p>0.05). The soil nutriments partial budgets revealed that soil fertility was improved with N profits (18.78±6.14 kg.ha-1) in all treatments, the gains of P (14.91±19.96 kg.ha-1) without composts application and the profit of K (5.25±5.49 kg.ha-1) with both fertilizers addition. The balance was negative for Ca and Mg independently of composts application. The both fertilizers had a positive effect on the immature cocoa trees height and its soil fertility improvement. Organic matter strategies were important for sustainable cocoa trees production in tropical zone.

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