Adubação mineral para a produção de porta-enxertos de seringueira em Açaílandia, MA.

Abstract

In the process of seedling formation, one of the prerequisites for obtaining early grafting seedlings is an adequate recommendation of fertilizers. Thus, in order to determine the nitrogen, phosphorus and potassium levels suitable for the production of plants suitable for grafting in rubber tree nursery, an experiment was conducted in a producer area, located in Açailândia, MA, in classified soil. as Red-Yellow Podzolico, and medium texture. The treatments corresponded to four nitrogen doses (0, 120, 240 and 360 kg X ha "1 of N) in the form of ammonium sulfate; phosphorus (0; 160; 320 and 480 kg. Ha'1 of P2Os) in the form of nitrogen. potassium triple superphosphate (0; 140; 280 and 420 kg. ha -1 of KO) as potassium chloride; and magnesium (0; 50; 100 and 150 kg. ha -1 of MgO) in the form of According to the results obtained, doses of 98.3 kg.ha'1 of N, 130 kg.ha'1 of P, 05188 kg.ha'1 of KJD and 44 kg.ha'1 are recommended. MgO, since they provided 85% utilization rate of plants suitable for grafting and the production of 64 600 commercial rootstocks per hectare.