Document Type : Original Article
Authors
1
Hort. Res. Inst., Agric. Res. Center, Giza, Egypt
2
Hort. Dept., Fac. Agric., Beni-Suef University, Egypt
10.21608/sjas.2025.410815.1520
Abstract
In a private farm in Meet Faris village, Dekarns District, Dakhlia Governorate, Egypt, two field experiments were conducted during two consecutive autumn seasons of 2022/2023 and 2023/2024 to examine the effects of planting dates (15 September, 30 September, and 15 October) and spraying with a natural stimulant substance , i.e., Seaweed extract (SWE) at 2 ml/l, salicylic acid (SA) at 200 ppm, melatonin (Me) at 30 ppm), beside water (control treatment) on growth, productivity, and tuber quality of potato Spunta cultivar under clay soil conditions using a drip irrigation system. Planting potato spunta cultivar on 15th Oct. during autumn plantation and spraying with seaweed extract at 2 ml/l produced the
highest leaf area index , dry weight of shoots, leaf pigments, average tuber weigh, number of tubers/ plant, yield / plant and total yield /fad., heat use efficiency , N, P and K (%), specific gravity, dry matter and starch contents in tubers, followed by the same planting date and spraying with salicylic acid at 200 ppm. The results also showed the possibility of obtaining a crop close to that of plants planted on October 15 without using any stimulants, with a planting date of 30th Sept. and spraying with seaweed extract at a concentration of 2 ml/liter.
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