EFFECT OF COMPOUND NPK AND FOAM SULFUR FERTILIZER LEVELS AND ASCORBIC ACID SPRAYING ON GROWTH AND YIELD OF SWEET CORNAli Hussein Jassi and Mohammed Rahim Hariz
Factorial experiment was carried out in Abu Gharaq area, 10 km west of Hilla city, to study the effect of foam sulfur addition, NPK levels and ascorbic acid concentrations on sweet corn growth and yield indicators. Randomized complete block design with three replications was used. The experiment included three factors, two levels of foam sulfur (0 and 20 kg ha-1, three levels (0, 75 and 150 kg ha-1) of compound fertilizer NPK (20:20:20) and three concentrations of ascorbic acid (0, 25 and 50 mg L-1. The seeds were planted at 16 August, 2018 and harvested at 20 November, 2018. The results showed that the addition of (20 kg ha-1 foam sulfur achieved a significant increase in most growth and yield indicators and gave the highest yield per plant (215.5 g). The level of 150 kg ha-1 compound fertilizer significantly achieved higher values of most studied traits. Spraying ascorbic acid at a concentration of 50 mg L-1 significantly increased plant leaves number, leaf area, chlorophyll index, ear diameter, number of grains per row, bio-yield, single plant yield and leaves content of phosphorus, and equal with the concentration of 25 mg L-1 in its effect on ear height, and length. The interaction between the factors caused significant effect on most of the studied traits.
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