02374naa a2200301 a 450000100080000000500110000800800410001910000240006024500990008426000090018352015260019265000150171865000170173365000160175065000130176665000140177965300220179365300160181565300120183165300260184365300270186965300150189670000150191170000220192670000170194870000150196577300920198010525202012-11-16       1992    bl ---       0--  u    #d1 aLOPEZ-CANTARERO, I.  aVariations in nutrient levels in watermelon cultivars irrigated with saline waterbtotal ions.  c1992  aFew studies have been published on nutritional parameters in greenhouse cultivated watermelon despit the importance of this species in the human diet. It was therefone considered worthwhile to study some of the cultivars soon to become commercially available in Spain to determine which of them are best suited to cultivation in areas along the Mediterranean coast. All ten cultivars of Citrullus lanatus (Trunb) Mansfield studied were grown in polyethylene covered greenhouses. Four replications of each cultivar distributed in random blocks. Leaves were sampled every 15 days during one complete biological cycle to determine total macro and micro nutrients. These data were then related to productivity (fruit yield). The different cultivars presented marked differences in both macro and micronutrient levels: total N in Perla-Negra (Black Pearl) was twice that found in Tolerant, while total K in Resistant was double that in Candida. Total proteins also differed significantly between cultivars as did productivity. All high yielding cultivars grown in greenhouse conditions showed high but varying nutritional requeriments, with different optimal ranges of total nutrients. Upon comparing nutritional needs and productivity, efficiency in descending order wasPerla-Negra, Panonia, Tolerant, Candida, Sugar-Baby, Rocio, Fabiola, Carmit, Early-Star, and Resistent. On the basis of nutritional diagnoses, nutrient values were classified as low, optimal and high, in relation to productivity and total nutrient levels.  airrigation  aÁgua Salina  aIrrigação  aMelancia  aVariedade  aCasa de vegetacao  aCultivation  aCultivo  aNutritional variation  aVariação nutricional  aWatermelon1 aGUZMAN, M.1 aVALENZUELA, J. L.1 aRIO, A. del.1 aROMERO, L.  tCommunications in Soil Science and Plant Analysisgv. 23, n. 17/20, p. 2809-2822, 1992.