Pepper

FYM: Farmyard Manure. FA: The fulvic acid. RDF: Recommended Dose of Fertilizers.

Table1 Effect of spraying fulvic acid on pepper yield

Results： The application of fulvic acid significantly increases the number of fruits per plant. Among the treatments, foliar spraying with 200 mg L⁻ ¹ fulvic acid yielded the highest number of fruits per plant. Green Fruit Yield (g per plant) Fresh Fruit Yield: Compared to the control (no application) and water spray, foliar application of fulvic acid at different concentrations significantly increased the fresh green fruit yield per pepper plant. Dry fruit yield: At 30 and 45 days after pepper transplanting, foliar application of different levels of fulvic acid (50–400 mg L⁻ ¹ FA) significantly increased dry green fruit yield compared to the control (no spray) and water spray. The 200 mg L⁻ ¹ FA treatment (T5) yielded the highest dry fruit production at a significant level. The application of fulvic acid significantly and sustainably increases pepper stem yield, enhances metabolic activity, and promotes both root and above-ground growth in crops.

Table 2 Effect of fulvic acid on the quality of pepper

Results： Fruit length: Application of fulvic acid significantly increased fruit length, with data showing the maximum fruit length (8.96 cm) at the 200 mg L⁻ ¹ (T5) treatment level. Fruit circumference: Compared to the control group (untreated) and water-only sprays, applying different levels of fulvic acid as a foliar spray, combined with the recommended fertilizer dose and FYM, also significantly increased the fruit circumference of chili peppers. Ascorbic acid content: Application of fulvic acid significantly increases ascorbic acid content. Data indicates that 200 mg L-1 FA yields optimal results, while excessively high fulvic acid levels reduce ascorbic acid content.

Figure 1 Growth-Promoting Effects of Humic Acid Water-Soluble Fertilizer on Different Crops

Treatments: P100 = standard dose application of phosphorus fertilizer; P85 = 85% dose; P70 = 70% dose; P0 = no phosphorus fertilizer; and the TP100, TP85, TP70, and TP0 treatments, in which a Trichoderma mixture was added to the P100, P85, P70, and P0 treatments, respectively.

Figure 2: Effects of Different Application Rates of Fulvic Acid and Inorganic Fertilizer on Chili Peppers During the Green Fruit Stage and Maturity Stage

Results: Compared to inorganic fertilizers, the application of fulvic acid significantly increased chili pepper yields and enhanced overall plant vigor.