Nitrogen

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Abstract
Muskmelon seedlings (cv. Galia) were grown under hydroponic greenhouse conditions using 4 nutrient solutions containing 17 (N1 and P1) or 425 (N2 and P2) ppm of nitrogen and phosphorus. Four weeks after the beginning of nutrition, N‐stressed (N1P2) seedlings were transferred either to N2P1 or to N2P2 and P‐stressed (N2P1) seedlings were transferred either to N1P2 or to N2P2 for an additional growth period of 3 weeks. Repair of P‐stressed seedlings was faster than that of N‐stressed seedlings when both were transferred to N2P2. There was no difference in rate of seedling repair in N2P2 or N2P1 after N‐stress. In contrast, P‐stressed seedlings were repaired more rapidly under N2P2 than under N1P2. In N‐stressed seedlings new leaves appeared and the stem elongated at the beginning of repair. In repair of P‐stressed seedlings, existing old leaves first increased in size and then new leaves were produced. Dry weight/fresh weight ratios increased with seedling age and under nutrition stresses.

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