Shrivastava, L.K.Singh, OnkarMishra, V.N.Sonboir, H.L.Saxena, R.R.2020-10-072020-10-072020https://krishikosh.egranth.ac.in/handle/1/5810152742EVALUATION OF SOIL TEST BASED FERTILIZER PRESCRIPTION EVOLVED FOR MUSTARD (BRASSICA JUNCEA) CROP IN VERTISOLField experiment was carried out for “Evaluation of soil test based fertilizer prescription evolved for mustard (Brassica juncea) crop in Vertisol” during Rabi season, 2019. The objectives of the study were (i) To test the validity of the fertilizer equation derived for mustard. (ii) To monitor the efficiencies of soil test and fertilizer nutrients applied with FYM. The experiment was laid out in factorial randomize block design having sixteen treatments with replicated thrice. The each treatments, T1 - Control; T2 - N120 P60 K0; T3 - N120 P0 K40; T4 - N0 P60 K40; T5 - N120 P60 K40; T6 - YT 14 q/ha; T7 - YT 18 q/ha and T8 - YT 22 q/ha were applied alone and with FYM @ 5 t/ha. Fertilizer prescription equation for mustard developed in previous under STCR project as FN = 12.86 Y - 0.58 SN - 0.30 FYM, FP2O5 = 4.09 Y – 2.51 SP – 0.33 FYM and FK2O = 4.50 Y – 0.08SK – 0.07 FYM were used to calculating the fertilizer doses for yield targeted treatments. The soil of experimental field comes in the soil’s order of Vertisols, locally known as Kanhar. The soil of experimental field is clay in texture, having pH 7.4, EC 0.18 dSm-1, OC 0.58 percent and available N, P and K as 200, 16.2 and 308 kg ha-1, respectively. The grain and straw yield was recorded significantly higher (21.79 q/ha) with the treatment T8 (that received the STCR based fertilizer dose to achieve yield target of 22q/ha) followed by T5 (N120 P60 K40), T7 (YT 18 q/ha), T3 (N120P0K 40). The N P K uptake in grain, straw and total by mustard crop were significantly higher under treatment T8 (Yield target of 22 q/ha). Soil test based fertilizer dose for yield target of 22 q/ha found higher response and response ratio as compare to T5 treatment (N120 P60 K40). Higher efficiency of applied fertilizer nutrients were found under STCR based fertilizer application. The average values for fertilizer efficiencies of N, P and K were estimated as 33.83, 18.86 and 76.46 percent respectively. Similarly, the nutrient contributions from soil were estimated for N, P and K as 22.07, 55.22 and 8.47 percent, respectively. The efficiencies of organic source (FYM) were observed as 17.21 % N, 8.12 % P and 8.42 % K. The higher cost of cultivation was calculated with the treatment T5 (N120 P60 K40) followed by highest yield target treatment T8 (YT 22 q/ha) due to higher application of fertilizer doses. Gross return and B:C ratio from mustard was recorded higher with the treatment T8 (YT 22.0 q/ha). followed by treatment T5 (N120 P60 K40) and T7 (YT 18 q/ha). Application of FYM also showed higher gross return and B:C ratio over sole application of inorganic fertilizers.  EnglishThesis