Effect of Soil Type, Light Intensity, and Cultivar on Leaf Nutrients in Mustard Greens
2002
Makus, D. J. | Lester, G.
A greenhouse experiment was conducted near Weslaco,Texas (Lat. 26º 8’N, Long. 97º 57’W) between 17 Dec. 2001 and 14 Feb. 2002 to evaluate the effect of soil type, light environment, and cultivar on the leaf nutrients of mustard greens. Cultivars Tendergreen and Florida Broadleaf (Brassica juncea) were sown in four soils, Bobillo, Hebbronville, Hidalgo, and Raymondville (listed in order of increasing clay content), and grown in two light environments: 87 (50% shaded) and 168 MJ • m-2 (ambient) cumulative average hourly light having 18.2 and 19.0ºC mean season temperatures, respectively. Mustard greens grown under reduced light had lower leaf transpiration rates and ascorbic acid content, but had higher leaf area, chlorophyll, carotenoids, total N, NO3, and most leaf mineral nutrients. Root fresh wt., but not shoot fresh wt. was reduced by low light. Plants grown in heavier textured soil had increased leaf area at both light levels, but when grown in reduced light, leaf area, pigment, and nutrient levels were even higher than in the heavy textured soils exposed to ambient light. Leaf ascorbate was higher in plants grown in ambient light than in reduced light. Folate was not affected by cultivar, light, or soil type (P<0.05).
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