This experiment was conducted in Quanjiao County. Using the indica-type three-line hybrid rice variety Jiuyouyuehesi as the material, five fertilization treatments were set up to study the effects of different ratios of slow-release and controlled-release nitrogen fertilizers on rice yield, nitrogen fertilizer utilization rate, and economic benefits. Slow-release and controlled-release nitrogen fertilizers could effectively coordinate the population structure of rice, improve nitrogen absorption efficiency, and reduce nitrogen loss. This was a fertilization mode suitable for the simplified and efficient production of rice in Quanjiao County.

To screen out efficient control agents for wheat stem-end rot disease in Juye area of Shandong Province, a field comparison experiment of six agents was conducted from 2023 to 2024. The results showed that the 48% oximeoxazoline·zoxamide (T₃) treatment had the best efficacy. From the emergence stage to the filling stage, the disease index decreased by 56.1%, 56.7%, and 58.3% compared with the control (CK) without treatment, significantly inhibiting the spread of the disease. At the same time, this treatment promoted the growth of wheat seedlings, with an increase of 5.3%, 9.1%, and 19.2% in plant height, root length, and tiller number, respectively. The number of grains per spike and the thousand-grain weight increased by 8.2% and 6.1%, respectively, and the final yield increased by 14.8%, making it the best among the six treatments. Therefore, it was recommended as the preferred control agent for wheat stem-end rot disease in the local area to achieve the dual goals of disease green control and yield increase.

To clarify the application effect of different proportions of commercial organic fertilizer replacing chemical fertilizers in rice production in Tongcheng City, using Y-liangyou 900 as the experimental material, 5 substitution ratio treatments were set up. Through a randomized block field experiment, the influence on the yield components, yield and economic benefits of rice was explored. Both 25% and 50% substitution of commercial organic fertilizer for chemical fertilizers were economically feasible fertilization methods. Among them, the 50% substitution had the best comprehensive effect and could provide scientific fertilization basis for the green, high-quality and efficient production of Y-liangyou 900 in Tongcheng City.

TIn response to the "low nitrogen and low carbon" characteristics of the soil in the dry farming area of the Longzhong Loess Plateau and the problem of excessive application of chemical fertilizers, this study explored the optimal proportion of organic fertilizer substitution for chemical fertilizers to achieve green increase in potato yield and efficient synergy of resources. The experiment set up 6 treatments to measure yield, quality and fertilizer utilization rate, and combined with ¹⁵N tracing to quantify the nitrogen utilization mechanism. The conclusion showed that 20% organic substitution by matching slow-release nutrients with the peak nutrient demand, activating soil phosphorus and potassium, and enhancing carbon metabolism was a preliminary optimized technical paradigm for achieving "equivalent nutrient substitution of 20% chemical fertilizers-5.4% increase in yield-improvement in quality and efficiency" in arid areas.

To investigate the effects of close planting and water‑nitrogen coupling on the yield of seed maize and its formation process, a three‑factor orthogonal design was employed in this study, with three irrigation levels, three nitrogen application levels, and three planting densities. The regulatory effects of different treatments on agronomic traits, dry matter accumulation, yield components, and yield of seed maize were systematically analyzed. The results showed that different treatments had varying effects on agronomic traits, dry matter accumulation, yield components, and yield of seed maize. Among them, the W₂N₁D₃ treatment exhibited relatively high levels of kernels per row and single ear weight, and achieved the highest yield of 687.95 kg/667m², which was significantly higher than those of the W₃N₂D₁ and W₂N₀D₁ treatments. It was recommended that in this region, an irrigation amount of 250 m³/667 m², nitrogen application rate of 15 kg/667m², and planting density of 85 000 plants/667m² (W₂N₁D₃) be adopted to achieve both high yield and high efficiency in seed maize production.