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An experiment was conducted at agricultural research station, SKRAU, Bikaner during rabi season of 2017-18 to evaluate yield of mustard as influenced by date of sowing and varieties in western Rajasthan. The treatment consisted of three dates of sowings viz., 10th October, 25th October and 9th November were kept in main plot and five varieties viz. RH-119, NRCHB-101, RGN-48, RH-749 and Laxmi was kept as sub plot replicated thrice in split plot design. Crop sown on 25th October recorded significantly higher seed yield as compared to 9th November sowing. In case of stover yield of mustard maximum was recorded under 25th October as compared to 10th October and 9th November. Days taken for emergence were no significant difference in varieties. RH-749 taken maximum days for 50 per cent flowering as compared to all varieties and for Siliqua appearance maximum days also taken by RH-749 as compared to NRCHB-101 and it statistically at par with RH-119, RGN-48 and Laxmi. RH-119 days to maturity and no. of branches/plant were minimum as compared to all varieties and these were remained statistically at par with each other. Maximum number of siliqua /plants was recorded under RGN-48 which was superior over rest of varieties and statistically at par with NRCHB-101. Highest grain/siliqua was recorded under NRCHB-101 over RH-119, RGN-48 and RH-749.

An experiment entitled “Evaluation of the CropSyst model to simulate the effect of irrigation and nitrogen levels on clusterbean” was carried out at village Bajju, Bikaner, Rajasthan during kharif season of 2016. The treatment comprising 3 levels of irrigation (100, 200 and 300 mm) and 4 levels of nitrogen (0, 20, 40 and 60 kg N/ha) comprising a total of 12 treatment combinations in split plot design with four replications. The simulation of CropSyst model was utilized to quantify and verify the interactive effect of different irrigation and nitrogen treatments on the productivity of clusterbean using measurements from field experiment. The soil of site are loamy sand having 86.3, 7.8 and 5.9 % of sand, silt and clay, respectively in 0-15 cm soil depth with pH 8.1 and low soil organic matter content (0.13%). The prediction of the model for seed yield and biomass was acceptable with 17.1 and 22.1 % of RMSE which may be considered good prediction by the model. However, the simulated N-uptake was over predicted by model and did not agreed with field measurements with 39.8% RMSE. The soil moisture content at different stages of growth was well simulated by CropSyst. The RMSE of moisture content ranged from 0.0123 to 0.0278 in clusterbean.

A field experiment was conducted at Instructional Farm, Swami Keshwanand Rajasthan Agricultural University, Bikaner during rabi season of 2019-20 to find out the Influence of different levels and methods of N P K fertilizer application on the growth and production of wheat (Triticum aestivum L.) in Arid Region of Rajasthan. The experiment was laid out with 20 treatment combinations comprising in a split plot design and replicated three times. The treatment consisted of four fertility levels in main plot, viz. F0 - control, F1 - 50% recommended dose of fertilizer (RDF), F2 - 75% recommended dose of fertilizer (RDF), F3 - 100% recommended dose of fertilizer (RDF) and five foliar fertilization with soluble N P K in the sub plot viz. S0- control (no spray), S1- one spray (60 DAS), S2- two spray (45 & 60 DAS), S3- three spray (45, 60 & 75 DAS), S4- four spray (45, 60, 75 & 90 DAS). The results revealed that 100% recommended dose of fertilizer resulted in significantly higher growth and yield attributes as well as grain and straw yield over all other fertility levels. Application of 100% RDF recorded significantly maximum gross and net profit (₹ 108568 ha-1 and ₹ 76682 ha-1) with B:C ratio of 2.40 over the other applied treatments. Similarly, three foliar spray of soluble N: P: K recorded maximum growth and yield attributes as well as grain and straw yield of wheat over rest of treatments but remained statistically at par with four foliar spray. The same treatment also recorded significantly higher gross & net returns (₹ 98116 ha-1 and ₹ 67326 ha-1, respectively) with B: C ratio of 2.16 in comparison to rest levels of foliar fertilization except four foliar spray of soluble N: P: K.

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