Desenvolvimento e produtividade do algodoeiro em função de doses de adubo mineral e organomineral

Abstract

Cotton is the most important source of natural fiber used in the world. It is a very demanding culture in fertility and with high production cost. The use of erased organomineral fertilizers is an alternative to reduce these crop costs. Therefore, the objective of this work was to identify the response of the cotton crop under development and productivity with several doses of mineral and organomineral fertilization. The experiment was conducted in a pivot area in the city of Sacramento - MG, in the 2019/20 harvest. The experiment was conducted in a randomized block design (DBC), with 7 treatments and 4 repetitions, the treatment being variable according to fertilization: Mineral fertilization: 1. MAP 200 kg ha-1 100% of the P2O5 recommendation (104 kg P2O5 ha-1); 2. MAP 150 kg ha-1 75% of the P2O5 recommendation (78 kg P2O5 ha-1); 3. MAP 100 kg ha-1 50% of the P2O5 recommendation (52 kg P2O5 ha-1); Organomineral fertilization: 4. Organomineral 200 kg ha-1 (50% P2O5); 5. Organomineral 300 kg ha-1 (75% P2O5); 6. Organomineral 400 kg ha-1 (100% P2O5); 7. Organomineral 500 kg ha-1 (125% P2O5). The characters analyzed were: final plant population; plant height; numbers of reproductive and vegetative branches; number of bolls and mass of bolls, vigor and photosynthetic capacity, seed cotton productivity and fiber quality characteristics. There was no difference between treatments in fiber quality. The cotton culture responds differently to fertilization with different doses of organominerals for the characters plant height, chlorophyll content and seed cotton yield, quantity of bolls per plant, chlorophyll content, boll weight and fiber quality. The characteristics of cotton differ in the two fertilization systems (mineral and organomineral). The organomineral treatment was better in the boll mass and productivity.