Fertilizer integration on intercrop: implications on cacao growth, yield, bean quality, disease occurrence and profitability under rubber tree
2018
Mamon, N.S. Jr.
This study was conducted to investigate the effects of different rates of urea and vermicompost on the growth and yield of the cacao trees under mature rubber for one fruiting season (February to December 2015). The experimental design was factorial on a Randomized Complete Block Design with 15 treatments. The treatments were three rates of urea (0, 100 and 200 g/tree) and five rates of vermicompost (0, 1.5, 3.0, 4.5 and 6.0 kg/tree). The trunk circumference, leaf length and width, number of pods developed and harvested, pod and bean character, soil OM%, leaf Nitrogen content and prevalence of pest and diseases were evaluated. The application of 200g urea per tree produced significant increase from 4.86 to 8.44 kg (73.66% increase) in weight of harvested pods and from 23.32 to 26.40 g/pod(13.21% increase) dry bean weight and significant decrease in the pod index from 43.39 to 38.45 (11.36% decrease). Moreover, the heaviest and thickest pod husk was obtained from plants treated with 100 grams urea + 1.5 kg vermicompost. The highest mean number of beans/pod was obtained from trees applied with 100-200 g urea + 1.5 - 3.0 kg vermicompost. The soil organic matter content (%) and leaf N was slightly increased by application of fertilizer treatments. Pod borer infestation and nematode population were significantly affected by application of urea and vermicompost Application of 100 g urea/tree or 3.5 bags/ha gave the highest return of investment and was the most profitable source of nutrient.
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