A research trial was conducted at Agronomy Farm (SKUAST-K, Wadura, Jammu & Kashmir), during kharif 2017 and 2018 to evaluate nutrient removal in rice under various rice establishment methods and weed control measures. The study comprised of two factors: rice establishment techniques {Transplanting (TPR); Direct seeding (DSR) and System of rice intensification (SRI)} as main plot treatments and weed control measures {Butachlor @ 1500 g a.i ha⁻¹ (B); Penoxsulam @ 22.5 g a.i ha⁻¹ (P); Pyrazosulfuron ethyl + Pretilachlor @ 15 and 600 g a.i ha⁻¹ (PP); Bensulfuron methyl + Pretilachlor @ 60 and 600 g a.i ha⁻¹ (BP); 2 Conoweeding/Hand Weeding (CW/HW); Weed free (WF) and weedy check (WC)} as sub-plot treatments meant to evaluate the best establishment method and weed management practice for rice. Over DSR and transplanted rice, the SRI technique yielded a significant increase in dry biomass accumulation (17.04 and 17.20 t ha⁻¹) and grain (7.92 and 8.17 t ha⁻¹) and straw (9.60 and 10.17 t ha⁻¹) yields. Penoxsulam herbicide significantly showed higher grain and straw yield of 8.19 and 8.28 t ha⁻¹ and 10.13 and 10.44 t ha⁻¹, respectively, than other weed management measures by comparing the means using critical difference. TPR excelled in reducing dry weed biomass more than other established methods. All herbicides considerably reduced dry weed biomass, but Penoxsulam herbicide showed the greatest reduction in dry weed biomass and proved superior against complex weed flora. Weeds showed maximum contribution towards total Biomass under DSR, among rice establishment techniques. In contrast, among different weed control measures, it was maximum in weedy check treatment (Untreated Control) and minimum in penoxsulam treatment. SRI significantly excelled in crop (grain and straw) nutrient uptake compared to the DSR and TPR method, although different crop establishment techniques non-significantly influenced nutrient concentrations. Furthermore, penoxsulam treatment demonstrated higher crop (grain and straw) nutrient uptake among the various weed management measures. However, available soil nutrients were observed among establishment techniques, highest in DSR and lowest in SRI. Moreover, direct-seeded rice excelled SRI and transplanted rice in weed nutrient uptake, and among the different herbicidal treatments, penoxsulam recorded the lowest uptake in weeds. Nutrient budgeting demonstrated that DSR showed the maximum percentage of nutrient removal by weeds, and the minimum ratio was in TPR. In contrast, the lowest rate of nutrients removed via weeds were seen in penoxsulam application under various weed management measures.

The western Himalayan region is susceptible to minor climate changes because of its fragile ecology, which might threaten the valley’s prestigious ecosystems and socio-economic components. The Himalayas’s local climate and weather are vulnerable to and interlinked with world-scale climatic changes since the region’s hydrology is predominantly dominated by snow and glaciers. The Himalayas, notably the Jammu and Kashmir region in the western Himalayas, has clearly shown distinct and robust evidence of climate change. This study used observed data to examine the climatic variability and trends of change in precipitation and temperature for the Kashmir valley between 1980 and 2020. Gulmarg, Pahalgam, Kokernag, Qazigund, Kupwara, and Srinagar (Shalimar) meteorological stations in the Kashmir valley were studied in detail for long- and short-term as well as localized fluctuations in temperature and precipitation. The annual temperature and precipitation fluctuations were calculated using Sen’s slope approach, and the sloping trend was determined using linear regression. The research showed statistically insignificant growing trends in maximum and minimum temperatures throughout the Kashmir valley. The average annual temperature in the Kashmir valley increased by 1.55 °C during the last 41 years (from 1980 to 2020), with a higher rise in maximum and minimum temperature by 2.00 and 1.10 °C, respectively. However, precipitation showed a non-significant decreasing trend concerning time series analysis over 1980 to 2020 in Kashmir valley. Results of annual average maximum temperature at all the stations revealed that Pahalgam (2.2 °C), Kokernag (1.8 °C), and Kupwara (1.8 °C) displayed a steep upsurge and statistically significant trends; however, annual average minimum temperature followed an increasing trend from 1980 to 2020 at all the stations except Shalimar. However, non-significant declining trends in precipitation were recorded at all the locations in Kashmir valley. This changing pattern of temperature and precipitation could have significant environmental consequences, affecting the western Himalayan region’s food security and ecological sustainability.

Excessive nitrogenous fertilization in years resulted in larger nitrogen and profit losses. This problem can be reduced by using need-based and time-specific nitrogen management. Therefore, a field experiment was carried out during the Kharif season of 2019 and 2020 in order to evaluate the impact of precision nitrogen management on the phenology, yield and agrometeorological indices of hybrid maize genotypes at the Agronomy Research Farm, FoA Wadura, Sopore, SKUAST-Kashmir. The experiment was carried out in split-plot design consisting of maize hybrids (Shalimar Maize Hybrid-2 Vivek-45 and Kanchan-517) as main plot treatments and precision nitrogen management (T₁: Control, T₂: Recommended N, T₃: 25% N as basal ≤ LCC 3@20 kg N ha⁻¹, T₄: 25% N as basal ≤ LCC 3@30 kg N ha⁻¹, T₅: 25% N as basal ≤ LCC 4@20 kg N ha⁻¹, T₆: 25% N as basal ≤ LCC 4@30 kg N ha⁻¹, T₇: 25% N as basal ≤ LCC 5@20 kg N ha⁻¹ and T₈: 25% N as basal ≤ LCC 5@30 kg N ha⁻¹) as sub-plot treatments. Results demonstrated that maize hybrids showed a non-significant difference in attaining different phenophases during both years. However, Shalimar Maize Hybrid-2 demonstrated higher grain (62.35 and 60.65 q ha⁻¹) and biological yield (170.26 and 165.86 q ha⁻¹), a higher number of days to attain different phenological stages in comparison to Vivek-45 and Kanchan-517 thereby achieved higher heat units, PTUs, HTUs, PTI. The application of nitrogen through LCC ≤ 5@30 kg N ha⁻¹ noted higher grain yield (61.27 and 59.13 q ha⁻¹) and biological yield (171.30 and 166.13 q ha⁻¹) during 2019 and 2020 respectively. Higher values of Growing degree days (GDD), Heliothermal units (HTU), Photothermal units (PTU), Phenothermal index (PTI), heat use efficiency (HUE) and radiation use efficiency (RUE) were observed in the application of nitrogen through LCC ≤ 5@30 kg N ha⁻¹ and required the highest number of days to reach different phenophases than other treatments during crop growing seasons of 2019 and 2020. The results demonstrated that Nitrogen application based on LCC ≤ 5@30 proved effective and should be adopted in maize hybrids especially in Shalimar Maize Hybrid-2 to attain higher yield under the temperate climate of Kashmir Valley.

Increasing nitrogen use efficiency in rice intensification (SRI) is pivotal to achieving high crop yield and reducing nitrogen losses. To find the critical value of the leaf color chart (LCC) for real-time nitrogen (N) application in rice varieties under SRI, a field experiment was laid at the Research Farm, Faculty of Agriculture, Wadura, SKAUST-Kashmir in Kharif between 2019 and 2020. The experiment comprised two cultivars (SR-3 and SR-4) and eight LCC-based nitrogen managements (control, recommended dose of nitrogen (RDF), and three LCC scores (≤3, ≤4, ≤5 each with 20 and 30 kg N ha⁻¹). SR-4 produced significantly higher values for growth and yield parameters, producing higher grain yield (7.02 and 6.86 t ha⁻¹) compared to SR-3 (6.49 and 6.36 t ha⁻¹) between 2019 and 2020, respectively. An LCC value of 5 with 30 kg N ha⁻¹ produced maximum grain yield (7.84 and 7.70 t ha⁻¹) in 2019 and 2020, respectively, which were statistically at par with the LCC value of 5 with 20 kg Nha⁻¹. Pooled data revealed that the highest B: C ratio of 1.55 was recorded in cultivar SR-4 with an LCC value of 5 with 30 kg N ha⁻¹. Furthermore, agronomic and recovery efficiency of nitrogen remained maximum in LCC 5 with 20 kg N ha⁻¹ for both years. Grain yield recorded in LCC 3 20 kg N ha⁻¹ was similar to recommended nitrogen. The present study highlighted the need-based N application through LCC and proved effective in increasing the N-use efficiency and yield in rice.

A field experiment was conducted during the Kharif-2022 season at the Agronomy Research Field, FOA, SKUAST-Kashmir, to investigate the efficacy of nano-urea in improving nitrogen-use efficiency in irrigated maize. Ten treatments were evaluated viz., T1: Control, T2: Recommended dose of Nitrogen (RDN) as basal (prilled urea), T3: 75% RDN + 1 spray nano-urea at 2 ml L^-1 (60 DAS), T4: 75% RDN + 1 spray at 4 ml L^-1 (60 DAS), T5: 50% RDN + 2 sprays at 2 ml L^-1 (30 and 60 DAS), T6: 50% RDN + 2 sprays at 4 ml L^-1 (30 and 60 DAS), T7: 25% RDN + 2 sprays at 6 ml L^-1 (30 and 60 DAS), T8: 25% RDN + 2 sprays at 8 ml L^-1 (30 and 60 DAS), T9: 25% RDN + 1 spray at 6 ml L^-1 (60 DAS), T10: 25% RDN + 1 spray at 8 ml L^-1 (60 DAS). The experiment was carried out following a randomized complete block design with three replications. Results revealed that treatment T6 (50% RDN as basal + 2 sprays at 30 and 60 DAS at 4 ml L^-1 of nano-urea) exhibited superior performance compared to the recommended nitrogen dose (T2) and other treatments in enhancing nutri-ent-use efficiency. Notably, treatment T6 demonstrated the highest nitrogen uptake in grain (101.92 kg ha^-1) as well as stover (67.41 kg ha^-1), surpassing all other treatments. Additionally, agronomic efficiency was significantly higher in T8, while physiological efficiency peaked in T6. Yield attributes and overall yield showed consistent improvements in treatments receiving nano-urea. Furthermore, treatments utilizing nano-urea demonstrated higher net returns and benefit-cost ratios, with T6 particularly standing out. These findings underscore the potential of foliar application of nano-urea to halve the recommended dose of prilled urea, thereby enhancing nitrogen uptake, nutrient-use efficiency, yield, and economic returns, while promoting sustainability in agriculture.

Field experiments were conducted at the Faculty of Agriculture, SKUAST-Kashmir, Wadura, Jammu and Kashmir during kharif seasons of 2017 and 2018 to assess the effect of crop establishment methods and weed management practices on yield and yield attributes of rice (Oryza sativa L.) under temperate conditions of Kashmir. The experiment comprised of three crop establishment methods in main plots [transplanting (TPR), direct seeding (DSR) and system of rice intensification (SRI)] and seven weed management practices [butachlor @ 1500 g a.i. ha^-1, penoxsulam (@ 22.5 g a.i. ha^-1), pyrazosulfuran ethyl + pretilachlor (@ 15 and 600 g a.i. ha^-1), bensulfuron methyl + pretilachlor (@ 60 and 600 g a.i. ha^-1), twice cono-weeding/hand weeding, weed free and weedy check)] in sub-plots. The treatments were replicated thrice in a split plot design. The results revealed that SRI method of crop establishment gave significantly higher values for yield attributes viz., number of panicles (399.15) and grains panicle^-1 (96.62) that resulted in higher grain (8.04 t ha^-1) and straw (9.88 t ha^-1) yield as compared to direct seeding and transplanted method. Among the weed management practices, the application of penoxsulam (@ 22.5 g a.i. ha^-1) gave significantly higher grain (8.24 t ha^-1) and straw (10.29 t ha^-1) yield as compared to other weed management practices, except weed-free and weedy check treatments. The average grain and straw yield increase with SRI was 24.11 and 23.62% over DSR and 10.47 and 12.23% over transplanted rice. Highest B: C ratio of 1.60 was realized under SRI with the application of penoxsulam @ 22.5 g a.i. ha^-1