Hadia Hassan(1)* ,Sawsan Suleiman(1), and Maher Dais(2)
(1) Horticulture department- Tishreen University Lattakia Syria
(2) GCSAR, Lattakia, Syria.
(*Corresponding author: Hadia Hassan : Email:hadiahasan894@gmail.com)
Received:3/08/2021 Accepted: 14/10/2021
Abstract:
The research was carried out at Al-Hanadi Research Station of Lattakia Agricultural Scientific Research Center during 2019-2020 , to study the effect of humic acid HA ( from Humantic –Company-Germany) application (500, 1000 and 1500) ppm ,on Spunta potato growth and productivity at two levels (80% and 40% ) of the field capacity under greenhouse conditions. The experiment included 8 treatments repeated 3 times. The experiment design used a split plot system. After 35 days of planting, plants were sprayed with humic acid three times with an interval of ten days . The results showed a decrease in some vegetative and productive indicators at 40% level than at 80%. The lack of irrigation decreased plant height and the number of leaves and plant production (kg / plant) without affecting leaf area. Humic treatment at 1000 ppm gave the highest rate of photosynthesis (0.199 g / cm2 / day) at 40%level of field capacity . The highest number of leaves (25.125) leaf / plant and leaf area were recorded at 80%. Stem height, relative water content in leaves (64.93%), and photosynthesis rate increased with 1500 ppm at 80% level. the highest productivity (2.66) kg / m2 achieved at humic 500 ppm at 80%. Whereas, the best HA used efficiency was at 1000 ppm under water stress.
Key words: potato, Humic acid , water stress.
Full paper in Arabic: pdf