Ajwain is the second most important seed spice crop in Andhra Pradesh, India. It is grown as rainfed crop in vertisols. The crop is sown usually during July to September as a rainfed crop. There is a need for identifying suitable high yielding genotypes adaptable to rainfed vertisols. In view of this, fourteen genotypes were evaluated for their performance in rainfed vertisols for four years. The uniqueness of the rainfed environment which varies with year to year was taken as advantage and Additive Main Effect and Multiplicative Interaction (AMMI) analysis was used to understand the complex genotype x environment (GE) interactions. Further AMMI Stability Values and Genotype Selection Index (GSI) were worked out for the genotypes. Stability when assessed should be reliable. Genotype Selection Index (GSI) due to its nature of combining the estimated the stability measure and yield data, gave more useful information for selection and recommendation. The most desirable genotypes for selection of both stability and high grain yield were genotype 3 (LTa-26) followed by genotype 2 (LTa-25).
The present study was undertaken for three years to evaluate thirteen promising genotypes from India for both yield and diosgenin content. Maximum yield was recorded in genotype LFC-103 (584.1 kg ha -1 ) followed by HM-348 (542.8 kg ha -1 ). The diosgenin content in the studied genotypes varied significantly, similar observations were recorded with the diosgenin productivity. Local cultivar recorded significantly highest diosgenin content (0.92 %). The highest diosgenin productivity was recorded with UM-364 (3.97 kg ha -1 ) followed by NDM-119 (3.91 kg ha -1 ). The superiority of these genotypes can be attributed to their wide adaptability and robust growth under rainfed conditions.
A field experiment was conducted during the Rabi season of the year 2017-18 on potato with variety Kufri Ashoka to test the recommended dose of fertilizers (RDF) levels (0, 50, 75, 100, 125, 150%) with two organic manures (vermicompost 5 t/ha and mustard oil cake 2.5 t/ha) at research farm of Tirhut college of Agriculture Dholi, Muzaffarpur, Bihar. The experiment was carried out in randomized block design (RBD) with twelve treatments and replicated thrice. The soil of experimental plot was Entisols, sandy loam in texture under low available in N, P and K with pH 8.3. Among the yield, nutrient uptake and available nutrient in soil after harvesting of potato were recorded higher with the application of treatment T11 -150% RDF + 5.0 t/ha vermicompost which was significantly superior over T1 -absolute control, T2 -100% RDF, T3 -50% RDF + 5.0 t/ha vermicompost, T4 -50% RDF + 2.5 t/ha mustard oil cake, T5 -75% RDF + 5.0 t/ha vermicompost and T6 -75% RDF + 2.5 t/ha mustard oil cake but was statistically at par with treatments, T7 -100% RDF + 5.0 t/ha vermicompost, T8 -100% RDF + 2.5 t/ha mustard oil cake, T9 -125% RDF + 5.0 t/ha vermicompost, T10 -125% RDF + 2.5 t/ha mustard oil cake and T12 -150% RDF + 2.5 t/ha mustard oil cake.
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