RENDIMENTO DO INHAME ADUBADO COM ESTERCO BOVINO E BIOFERTILIZANTE

Abstract

The yam (Dioscorea spp), is one of the vegetables grown in Brazil, in a family farm system, playing an important socioeconomic role in Northeast Brazil. However the low fertility soils producing regions has been restricting their production.The work was performed in Areia , PB , in the period from February to November 2011. In order to evaluate the performance quality and the effects of the presence of symptoms of nematodes in yam (cultivar Da Costa ) , due to the use of different doses of cattle manure and concentrations of biofertilizers . The experimental design was a randomized block , split plot , 6 x 4 x 2 + 1, with three replays totaling 49 treatment and 147 plots in three replications. The plots were tested six doses of cattle manure (0, 6 , 12, 18 , 24 and 30 t ha - 1 ) combined factorially with four concentrations of biofertilizers ( 0 , 15, 30, 45 % ) , two plots were tested forms of application of biofertilizers ( soil and leaf ) and an additional treatment with conventional fertilizer ( manure and NPK ) . The average mass of roots increased linearly with increasing levels of cattle manure reaching maximum value of 1.80 kg at dose of 30 t ha-1 of manure. When the biofertilizer was applied on the sheet was reached maximum concentration of 1.76 kg at 45%. In soil biofertilizer gave average mass of 1.55 kg of tubers, depending on their concentrations... The maximum overall yield of tubers were 17.8 t ha-1 to 17.2 t ha-1 of manure and 18.2 and 12.3 t ha-1 at a concentration of 22% biofertilizer on leaf and soil respectively. For commercial tuber productivity reached maximum values of 15.2 and 17 t ha-1 obtained with 16.7 t ha-1 of manure and concentration of 25% of biofertilizer on the sheet, respectively. When the bio-fertilizer was applied to the soil yielded an average commercial yield of 11 t ha-1. The results of organic fertilization with manure and fertilizer were higher than conventional fertilization. The lowest percentage of tubers with symptoms of nematode that causes black shell was obtained with the 7.2% concentration in 29% of biofertilizer the sheet. The absence of biofertilizer resulted in a higher percentage of tubers with symptoms of black bark.