Improving growth, yield and fruit quality of strawberry by foliar and soil drench applications of humic acid

Organic compounds including seaweed extract were applied in organic production system and sustainable agriculture. One of these compounds is humic acid that was used widely in research and commercial programs. Humic acid is an organic acid obtained from humus and other natural resources with hormonal effects and improving nutrient absorption, increasing root and shoot biomass. In order to investigate the effect of foliar and soil drench applications of humic acid on growth responses of strawberry, this research was conducted as a completely randomized design. Well-rooted daughter strawberry cv. Paros plants were potted in ۳ liter plastic pots filled with leaf mold, field soil and sand (۱:۱:۱ v:v:v). After the establishment of plants, Greenhum (۱۳.۵% humic acid) was sprayed at ۳۰۰, ۶۰۰, ۹۰۰, and ۱۲۰۰ mg L-۱ and soil drench was applied at ۳۰۰, ۴۵۰, ۶۰۰, and ۷۵۰ mg L-۱ (۲۵۰ ml pot-۱). Results showed that foliar application at ۶۰۰ and ۹۰۰ mg L-۱ produced the highest dry mass of shoot and root. Total acid of fruit in ۷۵۰ mg L-۱ soil application and in ۳۰۰ mg L-۱ foliar application were significantly higher than untreated control plants. The greatest vitamin C and TSS were obtained from ۹۰۰ and ۶۰۰ mg L-۱ foliar application treatments, respectively. The highest flower numbers and yield were produced in ۹۰۰ mg L-۱ foliar application. In general, foliar application of Greenhum, especially at ۶۰۰ and ۹۰۰ mg L-۱, significantly increased most evaluated parameters.

کلیدواژه ها:

Fragaria ananassa ، Humic acid ، Seaweed extract