Abstract
Two field experiments were carried out at the College of Agriculture/ University of Baghdad during spring season 2017 on okra "Petra" to study foliar application of potassium and zinc on growth, green pod yield and seed production of okra. Split plot within RCBD design was used with three replicates for both experiments where potassium factor was used within main plot and zinc in sub-plot. Potassium sprayed with concentrations (0, 2000, 4000, and 6000) mg.l-1 while zinc sprayed with the concentrations (0, 30, and 60) mg.l-1. Results were showed that the potassium spray with concentrations 4000 mg.l-1 and the zinc spray with 30 mg.l -1 was superiored in plant height (114.36 and 111.60 cm.plant-1). Leaf area (271.46 and 267.86 dcm2.plant-1). Total chlorophyll (60.54 and 52.11 mg.100g-1 fresh weight). Fresh pods number (59.22 and 56.82 pod.plant-1). Fresh pod weight (5.59 and 5.15 gram.pod-1). Plant yield (331.84 and 301.39 gram.plant-1), respectively. While the potassium spray with concentration of 6000 mg.l-1 and the zinc spray with 60 mg.l-1 was superiored in seeds germination (92.22 and 90.67 %). Rapidity germination (10.28 and 9.99 day). Specific gravity (98.09 and 97.93 seed.5 gram-1). Oil in seeds (21.82 and 21.70 (%. Carbohydrate in seeds (33.98 and 33.42 %). Protein in seeds (22.01 and 21.70 (%, respectively. It could be recommended to use foliar of 4000 mg.l-1 potassium and 30 mg.l-1 zinc to increase growth and green pod yield and recommended to use foliar of 6000 mg.l-1 potassium and 60 mg.l-1 zinc to improve seed qualities.
Highlights
K2 treatment was significantly superiored in increasing plant height (114.36 cm.plant-1), leaf area.plant-1 (271.46 dsm2.plant-1) and chlorophyll concentration (60.54 mg.100g-1 of fresh weight) compared to control treatment K0 which gave the shortest plant height (95.98 cm.plant-1), lowest leaf area.plant-1 (177.61 dsm2.plant-1) and had the lowest chlorophyll concentration (35.96 mg.100g-1 of fresh weight)
The increase of nitrogen due to potassium spraying may have an effect on increasing the concentration of chlorophyll due to the importance of nitrogen in porphyrin structure, which interfere in chlorophyll formation (62) in table 1
K2 treatment was significantly superiored in increasing pod number (59.22 pod.plant-1), pod weight (5.59 g.pod-1) and plant yield (331.84 g.plant-1) when compared with the control treatment K0 which gave the lowest pods number (34.56 pod.plant-1), lowest pods weight.plant-1 (4.62 g.pod-1) and lowest plant pods yield (201.85 g.plant-1)
Summary
Zaver (35) reported that spraying zinc sulfate at concentration of 0.5% significantly increased okra plant height (76.19cm.plant-1), total yield (226.19 g.plant1), total chlorophyll content (4.54 mg.g-1), seeds germination (82.89%) and protein in seeds (22.96%).
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