| Autor(es): |
Mariano, Eduardo
;
Leite, Jose M.
;
Vieira-Megda, Michele X.
;
Ciampitti, Ignacio A.
;
Vitti, Andre C.
;
Faroni, Carlos E.
;
Franco, Henrique C. J.
;
Trivelin, Paulo C. O.
Número total de Autores: 8
|
Knowing the right fertilizer N source is a key management practice for improving nutrient use and productivity for sugarcane (Saccharum spp.). Therefore, this study evaluated the effect of fertilizer N sources on aboveground biomass (BM) and nutrient (N, P, K, Ca, Mg, and S) content for sugarcane ratoon. Two field trials under highly weathered tropical soils (Site 1, Typic Hapludox; Site 2, Typic Eutrustox) were conducted in the southeast region of Brazil. Five fertilizer N sources (organomineral fertilizer {[}OMF], ammonium chloride {[}AC], ammonium nitrate {[}AN], calcium ammonium nitrate {[}CAN], and urea) were applied on sugarcane at a rate of 100 kg N ha(-1). A control treatment was also included in the randomized complete block design. At harvest, total BM varied from 24.4 Mg ha(-1) (control and AC) at Site 1 to 44.2 Mg ha(-1) (CAN) at Site 2, total K content varied from 185 kg ha(-1) (AC) at Site 2 to 747 kg ha(-1) (OMF) at Site 1, and total N content ranged from 92 kg ha(-1) (AC) at Site 2 to 165 kg ha(-1) (AN) at Site 1. Use of CAN and OMF resulted in comparable or superior BM and nutrient content relative to the other N fertilizers. In contrast, AC did not increase BM and nutrient content (except for N and Mg at Site 1), but also decreased by 33% total N content than control at Site 2. Use of more efficient fertilizer N sources (e.g., CAN and OMF) could increase productivity and nutrient use for sugarcane ratoon systems. (AU) |