2026· Korean Journal of Environmental Agriculture· Vol 45, pp. 115-124· 0 citations· 22 references
Abstract
: This study was conducted to evaluate the effects of a compound fertilizer containing amino acids (CFAA) on the growth and quality of creeping bentgrass ( Agrostis stolonifera L.) and to investigate nutrients uptake. Treatments were as follow. No fertilizer treatment (NF), control (compound fertilizer 3 active ingredient nitrogen g/m 2 ), CFAA-1 (control+1 mL/m 2 ), CFAA-2 (control+2 mL/m 2 ), and CFAA-3 (control+4 mL/m 2 ). Changes in soil properties following CFAA application were negligible, indicating minimal alteration of soil chemical properties. Compared to the untreated control, CFAA treatments exhibited increases in growth and quality parameters, including turf color index, chlorophyll a+b content, shoot height, clipping yield, and shoot and root dry weights, as well as nutrient content and uptake such as nitrogen, phosphorus, and potassium. Significant positive correlations ( p ≤ 0.01) were observed between CFAA application rates and growth parameters, as well as nutrients uptake. These results indicate that CFAA application enhances nitrogen uptake, which is associated with increased chlorophyll a+b content and biomass production, ultimately contributing to improved turfgrass growth and quality.
To study how coarse-textured soils affect plant growth, yield, and Nitrogen (N), Phosphorus (P), and Potassium (K) content in eggplant (Solanum melongena L.), this study was carried out in pots using a factorial completely randomized design with three replications, and five different levels of humic acid (HA) (0, 40, 60, 80, and 120 kg/ha) was used during the 2024–2025 growing season. Field validation is recommended before making broad agronomic recommendations. Growth parameters, fruit yield components, N, P, and K concentrations in soil and plant organs were determined based on dry weight. Generally, plant height, leaf number, fruit diameter, and fruit weight increased significantly with HA application; the highest values were recorded at 80–120 kg/ha. Studied parameters were significantly affected by soil texture, loamy sand, and sandy loam, responding more strongly to HA than to loam. Most growth, yield, and nutrient concentrations recorded significant interaction effects between HA and soil texture. The availability of N, P, and K in soil increased with an increase in HA, as well as their accumulation in roots, shoots, and fruits. These results show that HA is effective as a soil improver and bio-stimulant for increasing eggplant productivity in coarse-textured soils; an ideal approach is the application of 80–120 kg/ha, which represents an optimal management strategy.
Azad Salih Abdullah Krusk· UHD Journal of Science and T...· 0 citations
Marginal soils are characterized by low nutrient availability, which adversely affects crop productivity. The incorporation of organic materials and cultivation techniques plays an important role in maintaining soil health and crop yield. This study aimed to evaluate the effects of photosynthetic bacterial fertilizers and the push-pull system cultivation technique. The research was conducted in Banjaran Village, Purbalingga Regency, utilizing a completely randomized block design. Treatments tested included S0 (control), S1 (50 mL/2L), and S2 (100 mL/2L), as well as P0 (control), P1 (lemongrass), and P2 (peanuts). Each treatment was replicated three times and analyzed using ANOVA, with Duncan's Multiple Range Test (DMRT) (α=5%) applied for significant differences. The observed variables included fresh plant weight, leaf area, fresh root weight, age of male flowers, and chlorophyll a levels. The results indicate that the application of photosynthetic bacteria significantly affects the fresh weight of the plants and the age of male flowers. However, there is no significant effect on leaf area, fresh root weight, and chlorophyll a levels. The push-pull system cultivation technique significantly affects chlorophyll a levels, although no significant differences were found in fresh plant weight, leaf area, fresh root weight, and age of male flowers.
Victor Bintang Panunggul, Niken Hapsari Arimurti Susanto, Ayu Sitanini et al.· Agro Wiralodra· 0 citations
Groundnut (Arachis hypogaea L.) is a vital oilseed and protein crop in sub-Saharan Africa. As a legume, groundnut can fix atmospheric nitrogen into its root nodules. However, fertilizer application is still necessary when other essential nutrients needed for improving the quality and productivity of the seeds are limited in the soil. This study therefore investigated the effects of organic (Super GRO at 200 ml/ha) and inorganic fertilizers (NPK 15:15:15 at 200 kg/ha, single superphosphate (SSP) at 60 kg/ha) on the growth, yield, and seed quality of four groundnut varieties (SAMNUT 23, SAMNUT 24, SAMNUT 25, and SAMNUT 28). Data collected were subjected to two-way analysis of variance to test significant differences among the varieties and fertilizer treatments at p<0.05. The inorganic fertilizers (NPK and SSP) had a marked influence on both pod and seed yield when compared to the organic fertiliser (Super GRO), where the latter promoted higher vegetative growth. Varietal differences indicated that pod and seed yield were significantly highest in SAMNUT 24 and lowest in SAMNUT 23. Regardless of variety and fertiliser, the percentage moisture, ash, fibre, protein, fat, and carbohydrate ranged from 9.60-9.91%, 1.22-1.19%, 2.20-2.10%, 18.63-19.47%, 39.67-40.58%, and 27.20-28.38%, respectively. SAMNUT 24 had the highest protein content in its seeds, while SAMNUTS 28 and 23 had the highest fat and energy values when they were compared to other varieties. The organic Super Gro promoted higher carbohydrate accumulation with limited protein, fat, and fibre and energy values when compared to inorganic fertilisers. The foregoing results indicated that SAMNUT 24 and SAMNUT 25 responded positively to fertiliser application, most importantly, the inorganic fertilisers. The cultivation of these varieties under inorganic fertilisers should be encouraged where there is low soil fertility.
U. Olayinka, Goodluck O. Ogundare, M. Babatunde et al.· Science Journal of Universit...· 0 citations
A field study was conducted to assess the combined effects of organic and inorganic fertilizers on the growth and yield of broccoli (Brassica oleracea var. italica) under coastal conditions in Bangladesh, characterized by slightly saline soil (EC 1.67 mS cm⁻¹). Six treatment combinations were tested: T₀ – Control (no fertilizer application); T₁ – 100% recommended dose of inorganic fertilizers (Urea, TSP, MoP); T₂ – 100% recommended dose of inorganic fertilizers + 2.5 t ha⁻¹ vermicompost; T₃ – 100% recommended dose of inorganic fertilizers + 5 t ha⁻¹ vermicompost; T₄ – 2.5 t ha⁻¹ vermicompost; and T₅ – 5 t ha⁻¹ vermicompost. Results showed that the combined application of 100% RDF with 5 t ha⁻¹ vermicompost (T₃) significantly improved all vegetative growth parameters, such as plant height, leaf number, leaf length, and leaf diameter, which subsequently enhanced curd diameter, net curd weight, and marketable curd weight, leading to the highest yield per plot. The strongest correlations (r = 0.946) were observed between yield and both net and marketable curd weight, indicating that curd biomass is the most direct determinant of yield. The study concludes that the integration of 100% RDF with 5 t ha⁻¹ vermicompost (T₃) is the most effective and sustainable nutrient management practice for maximizing broccoli growth and yield under coastal agro-ecological conditions of Bangladesh.
Int. J. Agril. Res. Innov. Tech. 16(1): 45-51, June 2026
Nishat Farabi, Mehedi Hasan, Mariha Rahman et al.· International Journal of Agr...· 0 citations
: The proportion of nitrogen (N), phosphorus (P), and potassium (K) in the soil could regulate plant yield and secondary metabolism. However, extensive chemical fertilizer utilization has reduced soil fertility and increased soil compaction, and even caused environmental pollution. Applying microbial fertilizers (MF) could improve soil structure and the environment. This work aimed to reveal the effects of N reduction and combined MF on Ginkgo biloba growth, soil properties, and microbial communities, and illustrate their interaction roles in improving Ginkgo leaf yield and flavonoid content. A field experiment with different fertilizer treatments, including low N, normal P-K (T1), low N, high P-K (T2), T1 + MF (T3), T2 + MF (T4), and MF (T5), was applied for Ginkgo trunk-cutting seedlings. Our data showed that the treatments of T2 and T4 both significantly increased the levels of net photosynthetic rate, flavonoid content, and yield in the leaves, and elevated the levels of nitrate-N, availability of P and K, and the activities of urease and acid phosphatase in the rhizosphere soil (RS). T2 treatment decreased bacterial diversity, increased the relative abundance (RB) of Nitrospirota and Gemmatimonadota in RS, and enhanced nitrate denitrification and nitrite respiration. However, T4 treatment significantly increased the RB of Acidobacteria bacterium WWH8 and delta-proteobacterium , and improved microbial bacterial metabolism of nitrogen, thiosulfate, photosynthesis, etc. Therefore, the reasonable proportion of NPK fertilizer combined with MF could regulate the nutrient use efficiency, enhance flavonoid synthesis, and raise leaf yield in Ginkgo forests by improving the bacterial community composition. Our work provided evidence for the benefits of fine-regulating NPK proportion and integrating MF measures to promote plant growth and secondary metabolism. Meanwhile, this also provided references for the in-depth exploration of the mechanistic interactions between rhizosphere organisms and plants.
Low soil fertility and inappropriate fertilizer management remain major constraints to seed yam production in the Nigerian savanna. This study evaluated the influence of NPK fertilizer types and rates on growth attributes, chlorophyll content, and tuber yield of Kpamyo yam (Dioscorea rotundata L.) minitubers. Field experiments were conducted during the 2023 and 2024 cropping seasons at the IITA research farm, Kubwa, Abuja, using a split–split plot design with three replications. Treatments consisted of three planting populations (266,000, 133,000 and 88,000 plant ha-1), three fertilizer types (NPK 15:15:15, 20:10:10, and 27:13:13), and four fertilizer rates (0, 200, 400, and 600 kgha⁻¹). Growth parameters, chlorophyll content (SPAD), and yield attributes were measured and subjected to analysis of variance. Results showed that fertilizer types and rates significantly (p<0.05) affected plant height, leaf area index, chlorophyll content, tuber yield, sett multiplication ratio and harvest index. NPK 27:13:13 promoted the most vigorous vegetative growth but produced comparatively lower tuber yield and harvest index, in contrast, NPK 15:15:15 consistently resulted in higher chlorophyll content and superior yield performance. Tuber yield increased with fertilizer rate up to 400 kg ha-1 but declined at 600 kg ha-1. Plant population density significantly influenced tuber size, with higher densities reducing mean tuber weight due to increased competition. The application of NPK 15:15:15 at 400 kg ha-1 provides the optimum nutrient combination for maximizing physiological efficiency and tuber yield of Kpamyo yam minitubers under Southern Guinea Savanna conditions, offering a practical strategy for improving seed yam production in Nigeria.
C.B. Tapgun, P.Z. Chuwang, B. Aighewi et al.· Journal of Agriculture and E...· 0 citations