Effect of paclobutrazol doses on nutritional and microbiological properties of mango (Mangifera indica) orchard soils.
Singh V. K., Neelima Garg, Bhriguvanshi S. R.
Author Affiliation: Central Institute for Subtropical Horticulture, Rehmankhera, Lucknow, Uttar Pradesh 227 107, India.
Indian Journal of Agricultural Sciences 75 : 738-739
Abstract : Paclobutrazol (2, 4, 6 or 8 g a.i. per tree) was applied as soil drench in mango (cv. Dashehari) orchards in India during September 2001, 2002 and 2003. The application of paclobutrazol at 8.0 g a.i./ha for 2 consecutive years increased the soil pH from 7.0 to 7.55. The soil organic carbon content decreased significantly under all treatments. P, K and Ca levels in soil increased at lower rates of paclobutrazol but decreased at higher rates (6 and 8 g a.i./ha). Na, Zn, Cu, Mn and Fe levels remained more or less the same. The microbial population increased in soil treated with paclobutrazol except at higher rates, which inhibited population growth. The effects of paclobutrazol (10, 20, 30, 40, 50 or 100 ppm) on the growth of Pseudomonas striata in a nutrient medium were also studied. The growth of P. striata increased up to 30 ppm paclobutrazol, then decreased with further increase in the paclobutrazol rate.