Influence of different micronutrient treatments on nutrient status of the soil, yield, growth and quality parameters in Muscat grapes (Vitis vinefera van L.)

摘要

A study was carried out to evaluate the influence of various micronutrient treatments on the soil nutrients, yield and quality parameters of the crop. Fourteen treatments involving Zn and B were applied to Typic Hapustalf over two growing seasons (1999 and 1999-2001). A perceptible increase for different Zn and B treatments was seen for alkaline KMnO_4-N, Olsen-P and NNH_4OAc-K. The DTPA-Zn content of the soil indicated positive effect of addition of Zn solubilizing bacteria (ZnSO_4 10 g vine~(-1)+ZSB) to the soil and was comparable with Zn enriched organics as well as Zn application at 20 g vine~(-1). Boron also depicted positive effect on Zn availability. The extent of yield increase was significantly highest for the micronutrient spray that received Fe and Mn alongwith Zn and B (37.8% in first crop and 60.2% in second crop) followed by Zn and B foliar spray treatment (34.8% in first crop and 54.4% in the second crop) than all other treatments and control. The juice percentage was higher in all the foliar application treatments that received Zn and B alone or in combination. The treatment that received Zn and B foliar spray recorded significantly highest number of leaves, leaf area, leaf area per veraision, number of bunches vine~(-1), volume ofcluster, weight of cluster, weight and volume of 25 berries. The quality parameters of grapes like TSS, TSS : acid ratio, brix, brix : acid ratio, brix yield per bunch and sugars were significantly improved for Zn and B application. The treatment that received per se B spray reduced the acidity of juice to the extent of 72% than the control besides recording highest values for TSS : acid ratio, brix, reducing sugars and total sugars.