Effect of nitrogen sources sulphur and boron on growth parameters and productivity of spring sunflower
2009
Shekhawat, K. | Shivay, Y.S.
A field experiment was conducted during spring seasons of 2005 and 2006 on a sandy loam soil at the research farm of the Division of Agronomy, Indian Agricultural Research Institute, New D~lhi to study the effect of different nitrogen sources, sulphur and boron on growth, physiological parameters and productivity of spring sunflower (Helianthus annuus L.). The effect of the two sources of nitrogen, i.e. prilled urea (PU) and calcium ammonium nitrate (CAN) on various growth parameters of spring sunflower like leaf area index (LAI), crop growth rate (CGR), relative growth rate (RGR) and net assimilation ratio (NAR) were remained statistically on par with each other. However, the application of higher doses of sulphur (50 kg sulphur/ha) and boron (1.5 kg boron/ha) enhanced significantly all the growth parameters. LAI increased substantially betwet;n 50-75 days after sowing (DAS) and the highest values were recorded at '75 DAS. Application of the nutrients increased the dry matter accumulation of the .crop plant and hence, other growth indices like CGR, RGR and NAR also increased significantly. The crop achieved the highest CGR in between 50-75 DAS while the RGR and NAR values were recorded highe~ at the initial crop growth stages and declined thereafter. The highest seed yield (2 011.9 & 2 001.9 kglha in 2005 and 2006 respectively) and total biological yield (4 207.1 & 4 177.4 kg/ha in 2005 and 2006, respectively) were obtained with application of 1.5 kg B/ha, S application also showed a significant effect on seed and biological yields. Harvest index (HI) was not influenced significantly due to above fertilization.
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