Abstract
ABSTRACT An experiment was laid out in a hot, arid part of Rajasthan, India to study the effect of nitrogen and gypsum applications on the establishment and growth of Salvadora persica on a sandy loam, saline alkali soil—waterlogged during the monsoon. Four different doses of nitrogen (0, 9, 18 and 27 g) in the form of urea were applied with two levels of gypsum (0 and 100% soil GR), with an application of farmyard manure (FYM) and drainage a common treatment at the time of planting only. Despite deficient rainfall—including a severe drought—survival ranged from 67 to 85% in different treatments after 60 months. The application of nitrogen in combination with gypsum (gypsum + 9g N) gave the best results—41% for height and 35% for crown diameter more than the untreated plants. Crescent shaped drainage trenches for individual plants helped in plant establishment and growth, serving the dual purpose of harvesting water and leaching salts. The site has shown substantial reduction in soil pH and electrical conductivity and improvement in percent organic carbon content during the study period. Protection and plantation activities promoted colonisation and the number of plant species increased gradually. Weed mass was influenced by the rainfall.
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