Abstract
Two experiments were carried out, the first at the College of Agriculture - University of Baghdad during spring season 2017 Everest cv. class (Elite) was used to study the effect of foliar application of calcium and magnesium and addition of humic acid to the soil on potato growth and yield, The layout of the experiment was factorial within RCBD design using three replicates. Calcium and Magnesium sprayed with concentrations (0, 500, 1000 mg.L-1), while the humic acid was added to the soil with (0, 0.75 gm.m2), The second experiment included storage of tubers produced from the spring season, with to study the effect of field treatments on improving the storability of the tubers. The results showed that the treatment of calcium spray was superior a concentration of 1000 mg.L-1 in plant height, leaf area, weight of tuber, plant yield and protein % in tubers after storage and reduced the percentage of damaged in tubers stored by 1.57%. The magnesium spray treatment with 1000 mg. L-1 exceeded the number of leaves, leaf area, number of tubers per plant, plant yield, the accumulation of dry matter and the percentage of protein in the stored tubers. Humic acid with 0.75 gm.m2 was superior in the plant height , the tuber weight and the single plant yield , the concentration of dry matter and the protein percentage in the stored tubers produced. The interaction treatment (500 mg.L-1 calcium + 0.75 gm2 of Humic acid + 0 mg.L-1 of Mg) was superior in the single plant yield which 1.28 kg.plant-1.
Highlights
Potato crop (Solanum tuberosum L.) is one of the most important vegetable crops in the world with the second stage after the grain crops and it is agood and cheap source of energy
Several studies were carried out to improve the growth of potato plants to increase its production per unit area, sachas using many types of fertilizers, which is an important to ensure the crop need of nutrients, but excessive use led to a decrease in the quality of the crop and pollution of the surface and groundwater which causes' a negative effect on the global climate [23], Calcium is an essential element of plant growth, the two processes of cell division and elongation require this element
Calcium increases vegetative growth of potato such as plant height and number of leaves [11], as well as its role in improving quality characters of the tubers especially protecting the tubers from damaged during storage period [24]
Summary
Potato crop (Solanum tuberosum L.) is one of the most important vegetable crops in the world with the second stage after the grain crops and it is agood and cheap source of energy. It plays an important role in the food security of many countries of the world [7]. Calcium enters in the middle lamella structure in the cellular as calcium bactate It contribute in phosphatidic acid formation which enters in the composition of cell membranes and improving its effectiveness and its various activities [13]. This study aims to estimation the possibility of improving the growth and productivity of potato plants and improving the storability by spraying it with calcium and magnesium and adding the humic acid to the soil
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