Crescimento e trocas gasosas em mudas de temoia no solo com fósforo e biofertilizante

Abstract

Among the aspects that includes fruit, seedlings production has gained prominence, as it is an alternative to the increase in employment preventing migration. However, they are still very scarce research on organic mineral fertilizer for the production of seedlings atemoya. The objective of this trial was to evaluate the growth, photosynthetic efficiency and gas exchange atemoya seedlings fertilized with phosphorus and biofertilizer. The experimental design was a randomized block with four replications, in a factorial 4 x 4, corresponding to four phosphorus doses: 0; 2; 4 and 6 g dm-3 and four concentration of the water biofertilizer 0; 20; 40 and 60%, using 300 ml per container. The experimental unit consisted of four plants. They evaluated the height of seedlings, stem diameter, absolute rate of growth in height, relative growth rate of the diameter, root length, leaf area, specific leaf area, dry weight of stem, leaf and shoot, relationship root of air ratio, leaf weight, quality index Dickson, foliar P, initial fluorescence, potential quantum efficiency of photosystem II and quantum yield baseline of photochemical processes in PSII, internal carbon, transpiration, stomatal conductance, photosynthetic rate, carboxylation efficiency and efficiency of water use. Data were subjected to analysis of variance and regression. Phosphorus stimulated most growth variables atemoeira seedlings on the other hand, increased levels of P inhibited the relative rate of growth in diameter, root length and root ratio shoots, internal CO2 concentration, transpiration and conductance stomatal seedlings. The concentration of 60% of biofertilizers provided greater root length, specific leaf area and Dickson quality index, and higher photosynthetic rate. The combination dose of 6 g dm-3 of phosphorus and 60% of biofertilizers provided higher carboxylation efficiency and efficient use of water.