บทคัดย่องานวิจัย

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Effect of nitrogen and sulfur applications on pot chrysanthemum production and postharvest performance. I. Leaf nitrogen and sulfur concentrations.

Macz, O.; Paparozzi, E. T.; Stroup, W. W.;

Journal of Plant Nutrition Year: 2001 Vol: 24 Issue: 1 Pages: 111-129 Ref: 33 ref.

2000

บทคัดย่อ

Effect of nitrogen and sulfur applications on pot chrysanthemum production and postharvest performance. I. Leaf nitrogen and sulfur concentrations.

The objectives of this research were to evaluate the effects of reducing nitrogen (N) applications by adding sulfur (S) and to determine if N x S interactions occur during the production and postharvest longevity of pot chrysanthemums. Pot chrysanthemum cv. White Diamond was grown in a peat-based medium following a typical production schedule except for fertilization. Plants received N at 50, 100, 150, or 200 mg/litre in combination with S at 0, 5, 10, 20, or 80 mg/litre. Variables evaluated were leaf N and S concentrations, plant height, leaf area, days to bud set, and first flower colour and inflorescence anthesis as well as size and longevity under simulated interior conditions. In this article, leaf N and S concentrations are the variables discussed. In general, N x S interactions were significant for leaf S, but not leaf N concentration. Applications of 50 mg N/litre resulted in poor leaf N and S concentrations and plants of questionable qualities. N applied at 100, 150, or 200 mg/litre in

combination with at least 10 mg S/litre had acceptable leaf N concentrations and produced plants of commercial quality. Thus, N applications can be reduced by half when S is applied during commercial production.