Mining Fertilization Partitioning in the Production of Cassava Crop

Abstract

Introduction: Produced throughout Brazil, in the territorial context cassava in the State of Acre stands out as the main crop in terms of the planted area. For cassava cultivation application of fertilizer at the right time can increase its efficiency of use by changing the accumulation of starch in the roots. Objective: To evaluate the productive performance of cassava in response to splittings of NPK fertilization in base and cover at different phenological stages. Methods: The experimental design was randomized blocks with four replications. The treatments consisted of 6 plots: T1 limestone; T2 limestone K + P 100% at planting N 100% 30 days after planting (DBH); T3 limestone K + P 50% at planting and 50% 60 DAP, N 50% 30 and 60 DAP; T4 limestone K + P 50% at planting and 50% 90 DAP N 50% 30 and 90 DAP; T5 limestone K + P 50% 30 DAP and 50% 90 DAP N 50% 30 and 90 DAP; T6 limestone K + P 50% 60 DAP and 50% 120 DAP N 50% 60 and 120 DAP. Harvesting was performed at the end of 10 months. Root length (cm) was evaluated; root diameter (mm); fresh root mass (kg.planta) and root yield kg ha-1. The variables were subjected to analysis of variance by the F test and the means by the Tukey test 5%. Results: The diameter and length of the roots per plant with or without fertilization were not significant. However, absolute values ​​performed at T3 for root length and T6 for root diameter showed the best results. The same root diameter treatment provided the highest values ​​of fresh mass and is related to increased diameter and fresh mass yield for final production. Conclusion: Fertilization performed on T3 and T6 with the nutrient application at two planting seasons and 60 DAP for T3 and 60 and 120 DAP for T6 increase yield rates.