Nitrogen Mangement Under Different Compost Levels for Lettuce Plant Grown in Coconut Fiber

Abstract

Two experiments were conducted at the roof of Central Laboratory for Agricultural Climate, Dokki, Giza-Egypt. Two lettuce types (Lactuca sativa L.) iceberg and romaine were transplanted at October during the two seasons (2006 and 2007) into white polyethylene container filled with coconut fiber media. The experiments aimed to study the effect of three nitrogen levels (50, 100 and 150 ppm) applied by fertigation and three compost levels (0, 2 and 4% by volume). The experimental design was a completely randomized factorial design with three replications. Using different nitrogen and compost levels were affected vegetative growth, nutrients content (N, P, K, Ca, Mg and NO 3 ) and yield. The obtained results indicated that the increasing nitrogen level up to 150 ppm significantly increased plant height, number of leaves per plant, dry weight and yield. Compost 4% level gave the highest vegetative growth and yield comparing with the other compost treatments. The highest nitrogen level (150ppm) combined with compost 4% increased vegetative growth and yield significantly. On the other hand, 50 ppm nitrogen gave the highest nitrogen use efficiency (NUE) and the least value of nitrate content in leaves followed by 100 ppm. The highest nitrogen level (150ppm) led to increase nitrate content over the healthy save line with different compost levels.

Effect of Foliar Feeding with Copper Nanoparticles on Growth and Yield of Broccoli Crosses

“…The difference in vegetative characteristics among hybrids may be attributed to the difference in their genetic structures which show the superiority of any of the above characteristics, or to the difference in the response of hybrids to the prevailing environmental conditions. This is consistent with what [16] found on the cauliflower, [11,17,18]. The results of the above tables also indicate that there was a significant effect of foliar spraying treatments with copper nanoparticles at a concentration of 20 mg.L -1 on the characteristics of chlorophyll, plant height, leaf area, characteristics of head weight and total yield in hectares.…”

“…The results of the above tables also indicate that there was a significant effect of foliar spraying treatments with copper nanoparticles at a concentration of 20 mg.L -1 on the characteristics of chlorophyll, plant height, leaf area, characteristics of head weight and total yield in hectares. In addition to its important role in improving plant performance through its participation in photophosphorylation and in the process of oxidation and reduction in the electronic transport chain, in addition to its important role in the synthesis of chlorophyll and other pigments, and this is consistent with [19] and this is consistent with what [20,21] found on the bean plant.…”

Effect of Organic and Biostimulaters (Zytonic-F) on Growth and Yield of Two Lettuce Cultivars

“…These results agree with what [13] found that there are significant differences in the studied traits (head weight, head length, head diameter, average stem length, dry weight and productivity) among five lettuce varieties, as it was found that Heavy Green and Murillo varieties They outperformed in all studied traits and gave higher yields compared to Royal Valmaine and Parris Island varieties. This may be due to the different nature of growth between the two varieties and to the different genetic factors and the response of the two varieties to climatic conditions, especially temperature [14] and this is in line with what was found by [15]. The cultivar Balady in the percentage of nitrogen, potassium and phosphorous over the cultivar Vanity.…”

Transformation of Indole-3-butyric Acid into Ionic Liquids as a Sustainable Strategy Leading to Highly Efficient Plant Growth Stimulators

“…The determined DM content (from 5.0 to 5.8%) can be considered normal for lettuce. − The earliest studies determined both lower and also higher content of DM in lettuce. The RWC is an important indicator of water status in plants, which reflects the balance between water supply to the leaf tissue and transpiration rate .…”