Abstract
A pot culture experiment was conducted with groundnut (CO 7) in a sulphurdeficient (7.19 mg kg-1) Inceptisol (Vertic Ustropept) at the Radioisotope(Tracer) Laboratory, Department of Soil Science and Agricultural Chemistry,Tamil Nadu Agricultural University, Coimbatore during October 2016 toJanuary 2017. The treatment structure comprised five levels of sulphur(0, 20, 40, 60, and 80 kg ha-1) along with the recommended fertilizer dose.The variation in yield and the changes in starch, sugars, cysteine, methionine,protein, and oil content with kernel development as influenced by thesulphur application were studied. The yield attributes viz., number of podspot-1, pod and kernel yield pot-1 and shelling percentage, were remarkablyinfluenced due to the application of sulphur up to 60 kg ha-1, which wascomparable with S @ 40 kg ha-1 and had an adverse effect with S @ 80 kgha-1. In all the stages of sampling (30 DAS, 15 DOP (75 DAS), 30 DOP (90DAS) and at harvest stage), starch, total sugars, reducing and non-reducingsugars of groundnut were found to decrease with increasing S levels withcontrol recording the highest value and S @ 60 kg ha-1 recording the lowestvalue. During crop growth, protein content and sulphur-containing aminoacids viz., cysteine, and methionine showed an increasing trend up to 60kg S ha-1 application and recorded comparable values with S @ 40 kg ha-1.Similarly, oil content in the kernel steadily increased with stages of kerneldevelopment. The highest oil content at all stages of kernel developmentwas recorded at 60 kg S ha-1.
Highlights
Groundnut (Arachis hypogaea L.), the king of oilseed crops, is the third most important oilseed crop of the world cultivated widely in 96 countries (Upadhaya et al, 2003)
Sulphur is inevitable for oilseed crops as it is involved in the synthesis of essential amino acids and is a vital
At 15 DOP, 30 DOP, and at maturity (45 DOP), kernels were separated from the plant for biochemical analysis which was carried out in was on par with sulfur @ 40 kg ha-1 at all stages of kernel development (Ta ha-1 recorded the highest methionine content of 0.85, 1.40 and 1.92 per ce (90 DAS) and at 45 DOP respectively (Fig. 2)
Summary
Groundnut (Arachis hypogaea L.), the king of oilseed crops, is the third most important oilseed crop of the world cultivated widely in 96 countries (Upadhaya et al, 2003). As the intensity of cropping is gradually increasing, the response of oilseeds to sulphur is increasing (Ghosh et al, 2002) and the variable response of groundnut to sulphur has been reported by many workers (Kumar et al, 2008; Ramdevputra et al, 2010; Giri et al, 2011). This investigation was attempted to study the importance of sulphur in realizing yield and quality of groundnut crop and to study the role of sulphur in influencing the biochemical constituents of groundnut
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