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Effects of Foliar Application Pure Amino Acid and Amino Acid Containing Fertilizer on Broccoli (Brassica oleracea L. var. italica) Transplants

Ghasem Shekari and Jamal Javanmardi

The greenhouse experiments were carried out to study the effects foliar application of L-cysteine, L-methionine and Aminoacid fertilizer (AA) on Broccoli (Brassica oleracea var. italica) transplants. L-cysteine, L-methionine and AA was applied at three concentrations, 0, 100 and 200 mg L-1 commencing from 20 days after the sowing. Physical and chemical properties of the transplants determined according to the methods described by Tabatabaee. Results showed that L-cysteine at concentrations of 100 and 200 mg L-1 increased the leaf area by 53% and 48%, while methionine and the amino-acid-bearing fertilizer, both at 200 mg L-1, increased the leaf area by 59% and 48% respectively. These percentages are expressed in comparison to the control. L-cysteine at concentrations of 100 and 200 mg L-1 increased the fresh weight of shoots by 50% and 55%, respectively, while methionine at 100 and 200 mg L-1 increased the fresh weight of shoots by 55% and 60% respectively. The amino-acid-bearing fertilizer treatments at a concentration of 200 mg L-1 increased the shoot dry weight of Broccoli seedlings by 38%, L-cysteine at concentrations of 100 and 200 mg L-1 increased the root dry weight by 26% and 60%, methionine at 100 and 200 mg L-1 increased the root dry weight by 31% and 177%. The results showed that methionine at 200 mg L-1 increased chlorophyll by 61%. The amino-acid-bearing fertilizer at a concentration of 200 mg L-1 managed to increase the length of transplants by 30%, compared to the control. Methionine at 100 and 200 mg.L-1 increased the amount of nitrogen in transplanted Broccoli by 36% and 38%.