A field experiment was conducted at farmer's field in Sivapuri village, Chidhambaram taluk, Cuddalore district, Tamilnadu with chilli variety K2 as the test crop. The experimental soil was sandy clay loam. The treatments consisted of application of inorganic fertilizers, organic manures and biofertilizers in different combinations. The experiment was laid out in randomized block design and replicated three times. The growth attributes and nutrient content were recorded at 60, 90 and 120 DAT. The results of the experiment revealed that the application of 75% recommended dose of fertilizers + poultry manure @ 5 t ha -1 + biofertilizers + 2% MgSO4 (T11) registered the maximum growth attributes (plant height, leaf area index, number of branches plant -1 , chlorophyll content) and nutrient content (N, P, K, Ca, Mg and S) of chilli.

In the present study, the integrated organic fertilizers were used to estimate the growth and yield of pearl millet. The treatments consisted of application of increased levels of recommended dose of fertilizer with organic manures for pearl millet. The treatments were; T1-100% RDF, T2-125% RDF, T3-75% RDF, T4-100% RDF+FYM @ 12.5 t ha -1 , T5-100% RDF+Poultrymanure@5tha -1 ,T6-100 % RDF+Vermicompost @ 5 t ha -1 , T7-100 % RDF+Pressmud@5tha -1 , T8-125% RDF+Poultry manure @ 5 t ha -1 , T9-125 % RDF+Vermicompost @ 5 t ha -1 , T10-125 % RDF+Pressmud @ 5 t ha -1 , T11-75% RDF+Poultry manure @ 5 t ha -1 , T12-75 % RDF+Vermicompost @ 5 t ha -1 and T13-75 % RDF+Pressmud @ 5 t ha -1 . The experiments were laid out in randomized block design (RBD) and replicated thrice. The result of the experiment revealed that the application of 125% recommended dose of fertilizer+vermicompost@5tha -1 (T9), significantly increased the growth, yield, quality and nutrient uptake of pearl millet followed by, T10 (125% recommended dose of fertilizer+Pressmud @ 5 t ha -1 ) respectively.

Based on detailed soil survey of the Tamil Nadu Agricultural University main campus farm, six series namely Palathurai (Pth). Somayanur (Smy), Peelamedu (Plm). Perianaickanpalayam (Pyk), Panaimarathupatti (Pmt) and Chavadiparai (Cvp) series were identified and mapped by the detailed soil survey. According to USDA system of soil taxonomy; the soils were classified as :.Pth and Smy Typic Haplustalfs, Plm Typic Pellusterts, Pyk Typic Chromusterts, Pmt Vertic Ustifluvents and Cvp Typic Rhodustalfs. Under the different interpretative groupings viz., land capability classification, storie index rating, soil and land irrigability, productivity rating and potential productivity rating of the soils of the farm, Smy and Pyk series were adjudged to be the best productive soils. The co-efficient of improvement values revealed that there was high scope to enhance the productivity of all these soils through extra investment.

Polyhalite is a natural mineral which contains potassium (K2O, 14%), sulphur (SO3, 48%), calcium (CaO, 17%) and magnesium (MgO, 6%). It is used as fertilizer for high value crops. Soil fertility, selection of fertilizer sources and application practices are all crucial factors in maximizing mineral nutrition during the cropping season. With an increasing demand for fertilizer, polyhalite was identified as a potassium source for crops. In view of this context, a present experimental work was conducted during 2021-22 at farmer’s field, Arachalur, Erode district, Tamil Nadu, India to study the influence of polyhalite on growth attributes, yield attributes and yield of sugarcane var. Co 11015. The experiment was conducted in sandy loam soil laid out in randomized block design with 10 treatments replicated thrice. The recommended dose of nitrogen and phosphorus was applied uniformly to all treatments. The potassium was applied in two sources, muriate of potash (MOP) and polyalite in different ratios and levels except control. The results of the field experiment revealed that sugarcane significantly responded to the application of two potassium sources and levels. The maximum values of growth attributes like plant height, number of leaves per stalk, leaf area index, leaf chlorophyll content, yield attributes and yield like, number of internodes per stalk, length of internode per millable cane, length of millable cane, diameter of millable cane, single cane weight, number of tillers per plant, number of millable cane, cane yield and sugar yield were recorded with application of RDF (NP alone) + 150% K (169.5 kg K2O/ha) as polyhalite (T8). The lowest respond was found in the treatment T1, which received RDF (NP alone).