บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effect of nitrogen and sulfur applications on pot chrysanthemum production and postharvest performance. II. Plant growth responses.

Macz, O.; Paparozzi, E. T.; Stroup, W. W.; Leonard, R.; Nell, T. A.;

Journal of Plant Nutrition Year: 2001 Vol: 24 Issue: 1 Pages: 131-146 Ref: 23 ref.

2000

บทคัดย่อ

Effect of nitrogen and sulfur applications on pot chrysanthemum production and postharvest performance. II. Plant growth responses.

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 concentration, plant height, leaf area, days to bud set, first flower colour and anthesis as well as size and longevity under simulated interior conditions. N x S interactions were significant for all plant growth response variables. Applications of 50 mg N/litre resulted in poor leaf N and S concentrations and plants of questionable qualities, yet maximum postharvest longevities. N applied at 100, 150, or 200 mg/litre in combination with at least 10 mg S/litre had acceptable leaf N and S c

oncentrations and produced plants of commercial quality with adequate postharvest longevity. Thus, N applied at 100 mg/litre was the lowest acceptable fertilizer rate. Thus, N applications can be reduced by half when S is applied during commercial production without compromising postharvest longevity.