AVALIAÇÃO DE TERMOFOSFATO EM PLANTAS DE ALFACE SOB CONDIÇÕES DE CASA DE VEGETAÇÃO

Abstract

The studies of phosphorus application forms and better distribution in soil, are objective of actual researches that need to understand better ways to distribute and make this product available in soil by the high utilization of this nutrient in agriculture and the high capacity of fixing. The present work objective to evaluate thermophosphate doses in lettuce plants in greenhouse in typical soil of the Cerrado region. The seedlings that had 15 days after germination, with sanitary conditions, were transplanted to pots with ravine soil, with a chemical and textural analysis of the soil having been previously conducted, being carried out in greenhouse. The experimental design was a randomized block, with six treatments and four replications. The treatments were: T1- Control; T2 - 25% less than the recommended dose; T3 - 50% less than the recommended dose; T4 - recommended dose; T5 - 25% more than the recommended dose; T6 - 50% more than the recommended dose; T7 - Super simple. The thermophosphate source was Yoorin MG®. The analyzed variables were: dry and fresh mass and phosphorus content with 15 days after transplant and harvest. The treatment T6 had higher significant results for the variables: dry mass in the evaluation one (MSAV1), fresh mass in the evaluation two (MFAV2) and phosphorus in the evaluation two (PAV2) and to the other analyzed t parameters there were not significantly difference.