Author(s):

P Kamalakannan

Abstract: A field experiment was conducted to find out most suitable organic and inorganic sources of nutrients with different levels of recommended dose of fertilizer to groundnut in loamy sand soil of Ayeekuppam village, Cuddalore District during December, 2008 and March, 2009. The experimental soil at Ayeekuppam belongs to Vadapudupet series (Typic Haplustalf) with loamy sand texture having having pH 8.1 and EC 0.41 dSm<strong>^-</strong>¹. The soil was low in organic carbon, alkaline KMnO₄–N, and Olsen<strong>-</strong>P and medium in NH₄OAC<strong>-</strong>K. The experiment was conducted with 10 treatment combinations (Refer table). The treatments consisted of different levels of NPK viz., 100%, and 75% and different sources of nutrients viz., farm yard manure @ 12.5 t ha<strong>^-</strong>¹, fly ash @ 10 t ha<strong>^-</strong>¹ and humic acid @ 20 kg ha<strong>^-</strong>¹ along with micronutrients boron @ 10 kg ha<strong>^-</strong>¹ and zinc sulphate @ 25 kg ha<strong>^-</strong>¹. The experiment was laid out in randomized block design (RBD) with three replications and tested with groundnut crop var.JL<strong>-</strong> 11.The results revealed that application of 75% RDF+ ZnSO₄ @ 25 kg ha<strong>^-</strong>¹+ boron @ 10 kg ha<strong>^-</strong>¹+ humic acid @ 20 kg ha<strong>^-</strong>¹ and farm yard manure @ 12.5 t ha<strong>^-</strong>¹ (T₈) recorded the highest pod and haulm yield in loamy sand (2452 and 3580kg ha<strong>^-</strong>¹) soil. Similarly, the dry matter production of groundnut was the highest in the above said treatments. The loamy sand soil recorded a DMP of 2105 kg ha<strong>^-</strong>¹ at flowering and 3335 kg ha<strong>^-</strong>¹ at peg formation stage. The treatment T₈ recorded the highest yield characters of number of pods plant<strong>^-</strong>¹(21.2), 100 kernel weight (47.02g) and shelling percentage (73.78). In the treatment T₆ <strong>-</strong> RDF + FYM+ ZnSO₄ + Boron the values of yield and yield parameters were on par with T₈ values. Among the sources tried, FYM was superior in the performance of yield and yield parameters. The humic acid was the next best source. The micronutrient sources zinc sulphate and borax was relatively better in their performance but fly ash showed poor performance. Thus the result revealed that 75% RDF + Farm yard manure @ 12.5 t ha<strong>^-</strong>¹+ ZnSO₄ @ 25 kg ha<strong>^-</strong>¹+ Boron @ 10 kg ha<strong>^-</strong>¹ and humic acid @ 20 kg ha<strong>^-</strong>¹ which resulted in better yield and yield parameters performance in loamy sand soil could be the best treatment.

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