Nutrient Uptake and Quality Parameters of Groundnut as Influenced by Gypsum and CaMS Super Application

A field experiment was laid on sandy loam soils during the rabi season 2020-21 by farmers field’s of Raikode village, Narwa mandal of Narayanapet district to study the nutrient uptake and quality parameters of groundnut as influenced by the effect of gypsum and CaMS super application.The effect of different levels of gypsum and CaMS super on nutrient uptake at harvest was found to be significant. An increase in the gypsum and CaMS levels increase the uptake at harvest. The maximum uptake of nitrogen (98.08 and 114.92 kg ha-1), phosphorus (13.69 and 15.41 kg ha-1), potassium (24.87 and 63.37 kg ha-1), calcium (29.20 and 125.45 kg ha-1), magnesium (17.17 and 39.23 kg ha-1) and sulphur (14.36 and 18.59 kg ha-1) in both pods and haulms at harvest stage was recorded in T6 treatment which was at par with T8 treatment N, P, K, Ca, Mg and S (90.57 & 109.47 kg ha-1; 12.28 & 14.96 kg ha-1; 22.18 & 59.92 kg ha-1; 29.05 & 120.97 kg ha-1; 16.61 & 37.94 kg ha-1; 14.11 & 17.98 kg ha-1, respectively) while the lower uptake was recorded in control treatment. Whereas quality parameters like aflatoxin content, acid value and iodine value were significantly influenced by the application of different levels of gypsum and CaMS super fertilizer. The aflatoxin content varied from 17.95 to 30.50 µg kg-1. An increase in the levels of gypsum significantly decreases the aflatoxin content in groundnut oil. The lowest aflatoxin content was noticed in the T6 treatmentwhich was at par with treatments T7, T6 and T5 with the aflatoxin content of 18.43, 20.38 and 20.54 µg kg-1, respectively. The acid value ranged from 0.80 to 1.72 mg KOH g-1. T2 treatment showed a significant increase in acid value over other treatments. Similarly, the application of phosphorus in the form of a single superphosphate significantly influenced the iodine value compared to the control. However, the highest iodine value (90.1 g 100 g-1) was recorded in the control treatment, while the lowest iodine value (72.1 g 100 g-1) was registered in the treatment receiving T2 treatment.