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- Title
Dry Matter Partitioning and Mineral Constitution Response of Sunflower (Helianthus annuus) to Integrated Nitrogen and Boron Nutrition in Calcareous Soils.
- Authors
Shehzad, Muhammad Asif; Maqsood, Muhammad; Wajid, Syed Aftab; Anwar-ul-Haq, Muhammad
- Abstract
Abundant plant growth and development prominently rely on adequate supply of macro and micro nutrients. Among various nutrients, nitrogen (N) and boron (B) holds great importance in sustaining and enhancing the productivity of sunflower. In calcareous soils of Pakistan, B deficiency is prevalent that affects the uptake of nutrients. The present field study aimed to assess the impact of B on biomass production and nutrient absorption in calcareous soils by considering different B doses (0-6 kg ha-1) under variable N rates (50-100% RN 'recommended nitrogen') for consecutive two years of 2011 and 2012. The growth traits as leaf area index, leaf area duration, crop growth rate, net assimilation rate and dry matter accumulation were significantly affected with B rate of 3.20-3.50 kg ha-1 with 100% RN. In addition, B rate of 3.44 kg ha-1 with 100% RN produced maximum biological yield and harvest index in both years. Leaf and achene N contents were higher by 3.32 and 3.38 kg B ha-1, respectively with 100% RN fertilization as compared to 75% RN and 50% RN. B fertilization at 3.50 kg ha-1 also had highest B contents in leaf and achenes under 100% RN. The lower B contents were found at reduced level of 50% RN in contrast to 100% RN. Chlorophyll pigments (chl a, b and total) were also affected positively with B rate of 3.46 kg ha-1 under highest level of N nutrition. However, higher biomass production and mineral uptake could be obtained at 3.0-3.50 kg ha-1 B rate with 100% RN compared to 75% RN and 50% RN nutrition.
- Subjects
EFFECT of nitrogen on plants; EFFECT of boron on plants; CALCAREOUS soils; TRACE elements in plant nutrition; PLANT growth; SUNFLOWERS
- Publication
International Journal of Agriculture & Biology, 2016, Vol 18, Issue 2, p257
- ISSN
1560-8530
- Publication type
Article
- DOI
10.17957/IJAB/15.0069