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Abstract
Dietitians and nutritionists have included vegetables among 4 of the 7 basic food groups used in planning meals. Because of the variety and quantity of vegetables we are able to furnish in this country, either fresh or processed, it is an easy task to prepare a well-balanced diet without too much concern for the differences in composition among vegetable types. It is no wonder, then that until very recently little attention has been directed to the differences which exist within vegetable types.
Abstract
Horticultural crops play an important role in meeting the needs of man for vitamins and minerals. The serious problem of calorie-deficient diets can be relieved by many horticultural crops, although most of the world’s food energy is derived from grains. It is generally accepted that the most serious problem of underfed people in the less developed countries is one of protein-calorie malnutrition, particularly in infants, young children and pregnant and lactating women (1, 6). What part do horticultural crops play or what part might they play in closing the protein gap?
Time Domain Reflectometry (TDR) is used to measure in situ soil moisture content and salinity of porous media. Commercially available TDR systems used for field measurements have limited use in laboratory scale experiments where short high resolution probes are needed. A short TDR probe was designed for use with high bandwidth TDR instruments currently available. The probes are designed from SMA bulkhead connectors using gold-plated stainless steel wire 0.035 inches in diameter. A 20.GHz digital sampling oscilloscope (11801; Tektronix, Beaverton, Ore.) with an SD-24 TDR sampling head is used with the probes to determine water content and ion concentrations in porous media. The 7.5- and 3.0-cm-long probes were used to measure soil moisture content and ion concentrations in laboratory columns. Fertilizer and water gradients were observed by using bromide salts brought into contact with the top of laboratory columns, 7.6 cm in diameter and 18 cm long, packed with container media [1 peat: 1 vermiculite v/v)]. Soil moisture measurements in the presence of high concentrations of salts were made by insulating the probes with Teflon heat-shrinkable tubing to minimize conductivity losses.
Abstract
Cultivars and breeding lines of carrot (Daucus carota L.) with established differences in sugar accumulation capacity were studied by growth analyses to identify associations of sugar content with other traits. Carrots were grown on both organic and sandy loam soils. At both locations the seasonal patterns for sugar content of a high sugar-accumulating cultivar/line (HSL) and a low sugar-accumulating cultivar/line (LSL) were similar. There was little or no association of growth indicators (dry weight accumulation, tap root dry weight, and leaf area index) with high or low sugar accumulation. Differences in sugar yields were associated with mean net assimilation rate (