Amaranthus Plant Nutrients and Soil Nutrient Dynamics with Cassava Peel Compost
2016
Makinde, Eyitayo A.
Composted cassava (Manihot esculenta . Crantz) peels may serve as a nutrient source in Amaranthus spp. cultivation. A screenhouse experiment was conducted to determine the rate of cassava peel compost needed to support optimum Amaranthus plant and residual soil nutrient content. A compost of cassava peel and poultry manure was applied at 0, 2.5, 5.0, 7.5, or 10 Mt.ha ⁻¹ 2 weeks before sowing Amaranthus seed in plastic containers. Plants were harvested 5 weeks after emergence by ratooning and plant regrowth harvested after an additional 5 weeks. Plant shoot N was highest due to application of 5 Mt.ha ⁻¹ of compost; P was generally reduced, with the highest reduction due to application of 5 Mt.ha ⁻¹ of compost. Shoot K content was increased, with the highest occurring due to application of 2.5 Mt.ha ⁻¹ of compost. Root nutrient N and K contents were highest due to application of 10 Mt.ha ⁻¹ of compost; P was highest due to application of 7.5 Mt.ha ⁻¹ of compost. Soil pH was most reduced due to application of 2.5 Mt.ha ⁻¹ of compost. Organic matter content, organic carbon content, and total N were most increased due to application of 10 Mt.ha ⁻¹ of compost; soil exchangeable K was lowest due to application of 5 Mt.ha ⁻¹ of compost. Application of 7.5 Mt.ha ⁻¹ cassava peel compost produced the optimum Amaranthus shoot nutrient content with optimum residual soil nutrient content.
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