The study on "Evaluation of Cropsyst model for yield and water productivity of clusterbean" was conducted on farmers field during kharif 2012 at village Mainawali in Hanumangarh district of Rajasthan. The soils of the area are alluvial and calcareous in nature formed under arid and semi arid climate. The soils of site are brown to greyish brown and dark grey in colour, besides being calcareous and slightly alkaline in reaction having 67.7, 11.1 and 21.0 % of sand, clay and silt, respectively in 0-15 cm soil depth with pH 8.09 and low soil organic matter content. The simulate yield of clusterbean were closer to the observed clusterbean yield. Simulations of early clusterbean above ground biomass development matched the field data reasonably well. Final above ground biomass, however, was over estimated by the model. The total water applied in clusterbean was 405.8 mm out of this 326.7 mm consumed in ET. Thus, ET constituted 81% of total water applied and deep drainage constituted 13% and rest 6% stored as residual soil moisture.

A field experiment was conducted at Research Farm of Agriculture Research Station, S K Rajasthan Agricultural University, Bikaner during 3 consecutive kharif season of 2014, 2015 and 2016with fourteen weeds control treatments of pendimethalin 1.0 kg/ha (PPI), pendimethalin 1.0 kg/ha (PE), imazethapyr + pendimethalin 800g/ha, imazethapyr + pendamethalin 900g, imazethapyr + pendamethalin 1000g, imazethapyr 50g, imazethapyr 70g/ha,imazethapyr + imazemox 60g/ha, imazethapyr + imazemox 70g/ha, oxyfluorfen 40g/ha, fenoxaprop p-ethyl 50g/ha, propaquizafop 62g/ha, weed free and weedy check in randomized block design with three replications. Weed free was found most effective to control weeds in groundnut and recorded lowest weed count and weed dry matter of both broad leaved and grassy weeds. Among the different herbicides, application of imazethapyr + pendamethalin 800g recorded efficiently controlled weed count and weed dry matter of both broad leaved and grassy weeds as well as significantly highest yield attribute and yield in groundnut over all the other herbicidal treatments viz. dry matter accumulation (75.2g), number of pods/plant (31.2), pod (2979 kg/ha), haulm (7711 kg/ha) and biological yield (10690 kg/ha). Among the different herbicides, application of imazethapyr + pendamethalin 800g recorded higher net returns of84132/haand B:C ratio of 2.22.

during Kharif seasons of 2015 and 2016 to test the efficiency of herbicides in groundnut. The experiment comprised of 14 weed control treatments arranged in randomized block design (RBD) with three replications. Among the different herbicides tested, imazethapyr + pendamethalin 1000 g/ha recorded lowest weed density and weed biomass of both broadleaved and grassy-weeds and significantly highest dry matter accumulation, number of pods/plant, pod, haulm and biological yield in groundnut over all the other herbicidal treatments.

A field experiment was conducted at Research Farm of Agricultural Research Station, Swami Keshwanand Rajasthan Agricultural University, Bikaner during three consecutive kharif season of 2013, 2014 and 2015. The experiment comprising ten weeds control treatments consisting of pendamethalin 1000 g/ha (PE), imazethapyr 50g/ha (3-4 leaf stage of crop), imazethapyr 70g/ha (3-4 leaf stage of crop), pendamethalin + imazethapyr 800g/ha (PE), pendamethalin + imazethapyr 900g/ha (PE), pendamethalin + imazethapyr 1000g/ha (PE), imazethapyr + imazamox 60g/ha (3-4 leaf stage of crop), imazethapyr + imazamox 70g/ha (3-4 leaf stage of crop), 2 hand weeding at 20 and 40 DAS and weedy check in randomized block design (RBD) with three replications. Two hand weeding at 20 and 40 DAS was found most effective to control weeds in greengram and recorded lowest weed count and weed dry matter of both broad leaved and grassy weeds. It was also recorded significantly highest branches/pant, leaf area index, total chlorophyll, protein content in seed, pods/plant, seeds/pod and seed, straw and biological yield over other treatments. Among different herbicides, pendamethalin + imazethapyr 800g recorded significantly higher net returns (31350/ha) and B:C ratio (2.70).

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CropSyst is one of the most important process-oriented simulation models largely used for field crops all over the world to study the effect of climate, soil and management practices on crop productivity. In the present study, we have calibrated and validated the CropSyst model for groundnut crop grown at farmer’s field in IGNP Stage-II of Bikaner. CropSyst model was calibrated using the experimental data of crop parameters, soil profile data and observed daily weather data of experimental site for 2012 and validated the experimental data of crop growth and yield parameters for 2013. The results of the study showed that the CropSyst model simulated the crop growth parameter data viz. green area index, seed yield, above ground biomass and N-uptake of groundnut reasonably well. The seed yield, above ground biomass and N- uptake was validated well by the model with relative error of 3.3, 2.2 and 8.4 %, respectively. The total water applied in groundnut was 728.9 and 619.6 mm in 2012 and 2013, respectively out of this 664.9 and 530.5mm consumed in evapotranspiration.

during Kharif 2014 and 2015 to study the efficacy of pre-and post-emergence herbicides in managing weeds in greengram (Vigna radiata) and herbicides carryover effect on Indian mustard (Brassica juncea) grown during succeeding Rabi seasons of 2014-15 and 2015-16. Ten weed control treatments, viz. pendimethalin 1000 g/ha pre-emergence (PE), imazethapyr 50 and 70 g/ha (early post-emergence; PoE), imazethapyr + pendimethalin (ready mix) 800, 900, and 1000 g/ha pre-emergence (PE), imazethapyr + imazamox 60 and 70 g/ha, two hand weedings at 20 and 40 days after seeding (DAS) and weedy check were evaluated in greengram grown in three replications with randomized block design (RBD). Two hand weedings at 20 and 40 DAS resulted in lowest weed density of broad-leaf and grassy weed, total weed biomass at 60 days after sowing, significantly highest number of branches per plant, pods per plant, seeds per pod and seed and straw yield compared to other treatments. Imazethapyr + pendimethalin 800 g/ha PE was at par with two hand weedings in managing weeds and increasing greengram yield. Application of herbicides did not cause any adverse effect on succeeding mustard in both years.

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