Crescimento e produtividade da cana-de-açúcar influenciada pela forma de aplicação e doses de fósforo

Abstract

Aiming to evaluate the growth and yield of sugar cane RB92579 in different doses and forms of phosphorus application , we conducted a field experiment with 15 treatments with Five triple superphosphate (PST) ( 0 , 50 , 100 , 150 and 200 kg ha-1 of P2O5 ) applied at the bottom of the furrow and three doses of reactive rock phosphate Bayvoar (FRB) ( 0 , 100 and 200 kg ha-1 of P2O5) applied to the total area of planting , totaling 60 plots. The experimental design was a randomized block with four replications. The experiment was conducted at the Marituba farm, belonging to the Paisa Plant, in the Penedo city-Al. Were evaluated: Population tiller , plant height , stem diameter , íncice leaf area , leaf concentrations of P in leaf tissue , levels of available phosphorus in the soil and agricultural and industrial yield of sugar cane. The rate of 200 kg ha- 1 of FRB regarding triple superphosphate , increased the production maximum , with 67.3 t ha- ¹ with a critical level of 88.1 mg dm-³ layer 0-0,2 m . For the 0,2-0,4 m layer to have the maximum output , the value of critical level was 33.28 mg dm-3 . The phosphorus content increased as foliar applied phosphorus in total area with the source of phosphate rock Bayvoar. The phosphorus content increased as foliar applied in the bottom of the groove match with the source superphosphate . The values of total recoverable sugars , Purity , Fiber , PCC and TPH were influenced by phosphorus application at the bottom of the groove through the source triple superphosphate . The phosphate rock from Bayvoar provided a significant increase in the final outcome of TPH . The use of reactive phosphate Bayvoar with triple superphosphate , increased the production of sugar cane to certain maximum level .