INTRODUCTION There is an increasing need to recirculate and reuse nutrient solutions in order to reduce environmental and economic costs. However, one of the weakest points in hydroponics is the lack of information on managing the nutrient solution. Many growers and research scientists dump out nutrient solutions and refill at weekly intervals. Other authors have recommended measuring the conce...

The objective of this study was to investigate the effects of foliar applications of potassium and zinc on the fruit yield and quality as well as leaf nutrient concentrations of pistachio cv. ‘Chrokeh’. The experiment was conducted based on a completely randomized block design with nine treatments and three replications per treatment. Treatments were three levels of K2SO4 (0, 1 and 2%) and thre...

Previous in vitro studies showed that the small intestine has reserve capacities for absorption of nutrients. However, the size of the reserve capacity is controversial. Therefore, we measured the intestinal capacity for absorption of energy in relation to the postprandial gastric delivery of energy into the gut. In minipigs, a 150-cm length of jejunum was perfused (1-8 kcal/min) with four nutr...

In a previous publication (6) at.tention was called to the fact that in aln experiment with tomato plants, those supplied with complete nutrient solution guttated while those in solutions lacking both nitrate and ammonium nitrogen did not guttate. At that time it was thought that the low pH of the solutions might have been responsible for the lack of guttation. Two additional observations made ...

Soybean plants (Glycine max L. Merr. var. Hawkeye), grown in nutrient solutions maintained at graded concentrations showed a large response in both shoot dry weight and total ion uptake. Growth rate was dependent upon nutrient concentration, even when quantity of nutrient was not limiting. Peak periods for absorption of specific ions at certain growth stages were not exhibited. Rates of ion upt...

Since the introduction of acid-citrate-dextrose (ACD) in 1947 to anticoagulate and preserve whole blood for transfusion, various improved formulas, such as citrate-phosphate-dextrose-adenine (CPDA-1), have been successfully introduced, extending the current acceptable blood storage time to 35 days. Additional nutrient-anticoagulant solutions, including CPDA-2, CPDA-3, AS-1, and AS-5, among othe...