Uma DeviKomal2024-03-132024-03-132023-06https://krishikosh.egranth.ac.in/handle/1/5810207465A field experiment was conducted during Kharif 2022 on the research farm of Pulses Section, Department of G&PB, Chaudhary Charan Singh Haryana Agricultural University, Hisar to evaluate the effect of Zn and Fe application at different stages on crop phenology, growth, yield, nutrient status and economics of greengram [Vigna radiata L. Wilczek]. The experimental trial was carried out in randomized block design, comprising eleven treatments and three replications on sandy loam soil having 7.8 pH, 0.30 dS m-1 EC and 0.28% organic carbon with low, medium and high available nitrogen (154 kg ha-1), phosphorus (17.4 kg ha-1) and potassium (380 kg ha-1) status, respectively. Different treatments adopted for evaluation were 0.5 % ZnSO4 and 0.5 % FeSO4 foliar spray either alone or combined at different crop growth stages and a soil application of ZnSO4 @ 25 kg/ha. Results revealed that RDF with foliar application of 0.5 % ZnSO4 and FeSO4 at both pre flowering and pod initiation stage recorded significantly higher plant height, dry matter accumulation. branches per plant, number of pods per plant, pod length, number of seeds per pod and 100-seed weight which was statistically at par with soil application of ZnSO4 @ 25 kg/ha with RDF. RDF + 0.5 % ZnSO4 + 0.5 % FeSO4 at pre flowering and pod initiation stages recorded the highest seed yield (1847 kg ha-1), straw yield (3463 kg ha-1) and biological yield (5310 kg ha-1) with the highest harvest index of 34.8 % which was statistically at par with RDF + soil application of ZnSO4 @ 25 kg/ha (1788 kg ha-1, 3406 kg ha-1, 5194 kg ha-1 and 34.4 %, respectively). The maximum protein yield (409 kg ha-1) was recorded with the application of RDF + 0.5 % ZnSO4 + 0.5 % FeSO4 at pre flowering and pod initiation stage. The application of RDF + 0.5 % ZnSO4 + 0.5 % FeSO4 at pre flowering and pod initiation stage recorded significantly higher Zn content in seed (29.3 ppm) and straw (20.6 ppm) and Fe content in seed (73.3 ppm) and straw (67.2 ppm). The application of RDF + 0.5 % ZnSO4 + 0.5% FeSO4 at pre flowering and pod initiation stage recorded the highest gross returns (136406 ₹ ha-1), net returns (75348 ₹ ha-1) and B:C (2.23) which was followed by soil application of ZnSO4 @ 25 kg/ha with RDF (132041 ₹ ha-1, 71203 ₹ ha-1 and 2.17, respectively).EnglishThesis