to be a food high in oxalic acid ( Council on Renal Nutrition, 2009 ). Potential health associations of oxalic acid (synonymous in this article with oxalate) are decreased bioavailability of other nutrients and increased risk of kidney stone formation
normally growing floricultural crops, ≈40 to 70 SPAD index units for plants receiving 200 mg·L −1 N ( Bi et al., 2010 ; Jeong et al., 2010 ). Plant nutrition. Foliar Fe, Mn, or Zn, averaging 162 μg·g −1 Fe, 228 μg·g −1 Mn, and 35 μg·g −1 Zn, did not
, there are no fertilizer guidelines on cultivated bush tea. The objective of this study was to determine the effects of treatment combinations of N, P, and K nutrition on growth characteristics and concentration of leaf total polyphenols in bush tea
Polyamine accumulation is a response of plants to various environmental stresses. Polyamine accumulation was assessed in relation to ammonium accumulation and ethylene evolution in tomato (Lycopersicon esculentum Mill.) under nutritional stress. Nutritional stresses were imparted on plants grown in quartz sand culture under greenhouse conditions with NH4-based modified Hoagland's solution or with NO3-based solutions without P, K, Ca, or Mg. The plants receiving NH4 nutrition were grown with or without 10-5 M (aminooxy)acetic acid (AOA) or 10-5 M silver thiosulfate (STS). Plants on nutrient deficient solution were grown with or without the AOA. When plants appeared with toxic or deficient symptoms, the new fully expanded leaves were collected and extracted by 5% perchloric acid for polyamine analyzes by HPLC. Plants receiving NH4-based nutrition had high putrescine and low spermidine concentrations. High spermidine and low putrescine concentrations occurred in plants receiving complete NO3-based nutrition. For plants receiving NH4-based nutrition, application of AOA suppressed accumulation of putrescine but had no effect on spermidine, and STS had no effect on polyamine accumulation. For plants receiving NO3-based nutrition without P, K, Ca, or Mg, the application of AOA restricted accumulation of putrescine and spermidine. High putrescine concentration was accompanied by high ammonium accumulation, high ethylene evolution, and stressinduced symptoms, indicating an association between polyamine accumulation and other stress-related phenomena.
Calcium (Ca) nutrition and the balance between Ca and other plant nutrients are key factors that affect fruit quality and storability. This is especially important for fleshy crops, such as apple, pear, tomato, pepper, and potato ( White and
Abstract
Orchard trees grow and produce in one place for 15 to 50 years. By the time they are bearing, they have extensive root systems and are able to exploit nutrients of the soil efficiently. How and when nutrients should be supplied to the tree distinguishes fruit nutrition from other branches of nutritional science. During the past 75 years tree-nutrition developed from an uncomplicated method of replacing used nutrients to the soil to an intricate science which requires the total understanding of the physiology of the tree and which is completely integrated into the management practices of the orchard. This review follows the changes which led to the development of “tree-nutrition” as we know it today.
indicated that fertigation method affected tree size and nutrition but had minimal effects on fruit quality in the first four growing seasons, when cropping was initiating and yields were low ( Neilsen et al., 2004a ). It is unknown whether relationships
pungency ( Estrada et al., 2002 ). In the past, plant breeders focused on agronomically important traits such as yield and disease resistance. However, with increased demand from informed consumers for more nutritional and diverse fruits and vegetables
Nutritional status of apple (Malus domestica Borkh.) trees may influence regularity of cropping through effects of some nutrient elements at various stages of the floral initiation, development, pollination, fertilization and fruit setting process. Other elements may influence regularity of cropping more indirectly as consequences of their effects on physiological processes or by modifying the sensitivity of the tree to adverse environmental factors. This report provides a brief summary of reported impacts of mineral nutrition on regularity of cropping.
studies have verified the importance of the combination of red and blue light for improving plant growth and nutritional quality compared with than monochromatic light in crops such as lettuce, cucumber, soybean seedlings, and pak choi ( Chen and Yang