Responses of Physiological Indices of Forage Sorghum under Different Plant Populations in Various Nitrogen Fertilizer Treatments
Journal Title: International Journal of Plant & Soil Science - Year 2017, Vol 15, Issue 2
Abstract
In order to evaluate physiological indices of forage sorghum in different plant densities and nitrogen levels, an experiment was conducted at Research Farm, Faculty of Agriculture, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran. The main plots were plant densities, namely, 250000, 300000, 350000, and 400000 plants per ha, and four levels of nitrogen, namely, 0, 80, 160 and 240 kg N/ha were sub-plots. The field was under cultivation of barley during the previous winter. For all plant density treatments, from 25 days after plantation until 95 days after planting, the total dry matter trend increased gradually. The highest total dry matter was observed in 95 days after plantation which was related to 400000 plants per ha and 240 KgN/ha. Study the trend of variances of crop growth rate showed that in all treatments, the crop growth rate was low in the beginning of sampling, thereafter increased considerably up to 60 days after planting with a peak in 60 days after planting, then showed a declining trend after that. In all of plant density treatments, RGR decrease during plant growth and reached to a zero at 75-85 days after planting, and it reached into negative after these days until harvesting time. In different plant nitrogen levels, RGR trends also decrease during plant growth and reached to a zero at 40-60 days after planting. The maximum LAI was obtained for 400000 plants per ha and 160 kgN/ha. Study of trend of net assimilation ratio (NAR) showed that in all treatments, the NAR was stable in the beginning of sampling, thereafter showed a declining trend that toward zero (90-95 days after planting).
Authors and Affiliations
Mohamad Hesam Shahrajabian, Ali Soleymani
Keywords
Related Articles
- EP ID EP316529
- DOI 10.9734/IJPSS/2017/32460
- Views 111
- Downloads 0
Impact of Some Soil Amendments and Different Tillage Depths on Saline Heavy Clay Soils Properties and Its Yield Water Productivity
Soil salinity and sodicity are core limiting factors to sustainable agriculture activities in several parts of Nile Delta, Egypt. To such, we investigated the effects of combined applications of compost, gypsum and tilla...
Varied Responses and Tolerant Mechanisms towards Salinity Stress in Plants
Among several abiotic stresses, which retard crop production on at least 1/5th of irrigated land worldwide, high saline conditions seems to be the most severe environmental stress. The plant can reveal the effects of sal...
Effects of Seed Treatment on Removal of Physical Dormancy in Canna indica L.
The effects of different seed treatments on the germination of Canna indica L. were investigated. The seeds were subjected to chemical (sodium nitrate, sulphuric acid and hydrochloric acid), physical (hot water) and mech...
Anti-Alternaria solani Activity of Onion (Allium cepa), Ginger (Zingiber officinale) and Garlic (Allium sativum) In vitro
Plant pathogens cause serious losses in quantity and quality of agricultural products. Use of fungicides is gradually becoming unpopular due to their negative effects on ecosystems, human and animal health, and due to re...
Influence of Water Stress and Rhizobial Inoculation on the Accumulation of Chlorophyll in Phaseolus vulgaris (L.) Cultivars
Aims: To assess the effect of water stress periods and rhizobial inoculation in five (5) P. vulgaris (L.) cultivars. Study Design: The experiment was designed in split-split plot and replicated 3 (three) times. Place an...