Historical variation in the mineral composition of edible horticultural products

Summary

Historical variation in the mineral composition of edible horticultural products was determined from UK and USA food survey data. From these data, it was possible to measure the variation in the mineral composition of edible horticultural products in general, and in edible horticultural products grouped as vegetables, fruits or nuts, in the 1930s and in the 1980s (or later) for both countries. Thus, the hypothesis that the mineral composition of edible horticultural products had altered since the 1930s was tested. The average concentrations of Cu, Mg and Na in the dry matter of vegetables, and the average concentrations of Cu, Fe and K in fruits decreased significantly between the 1930s and the 1980s in the UK. The same hypothesis was tested with comparable data from the USA, whose historical horticultural and consumer practices have paralleled those of the UK. Data from the USA showed that the average Ca, Cu and Fe concentrations in the dry matter of vegetables, and the average concentrations of Cu, Fe and K in fruits had decreased significantly since the 1930s. There were insufficient data to determine if the mineral composition of any single edible horticultural species had altered significantly over time either in the UK or in the USA. The nutritional implications of this study are discussed. Since horticultural products in general, and fruits and nuts in particular, are relatively small contributors of minerals to the average UK diet, historical changes in mineral composition are unlikely to be significant in overall dietary terms.     

园艺产品的保鲜链

提出了园艺产品保鲜链、鲜活度和营养值等新概念。研究了保鲜链的模式和内容。探讨了适于中国国情的园艺产品保鲜链结构。提出从产品采收到消费的全过程都在保鲜链上进行，这样能保持产品的鲜活品质和营养价值。保鲜链以冷藏、气调库为主体，辅以系列保鲜技术。完整的保鲜链要考虑采前因素，以现代化、经济实用、安全绿色为目标。     

园艺植物在居室环境中的运用

居室环境是指人们生活、工作和休憩的室外庭院和室内环境。随着工业化的发展,大量使用人造建材进行美化和装饰工作、生活环境,使人们的居室环境污染也成为值得关注的重要议题。尤其对城市居民来讲,每天平均大约80%～90%以上的时间是在各种室内环境中度过的,居室环境成为直接影响人们生活的关键。园艺植物在居室中的各种运用,不仅美化居室环境、净化空气、减轻污染、改善居室理化条件,还能使生活环境增添生命的气息,增进身心健康。     

Rootstock/scion relations in horticultural crop physiology

A preliminary report is made of the results of growth studies on compound trees formed of all combinations, as scion and as rootstock, of three clones, chosen to cover a wide range of vigour, of apple, quince, and cherry.Under the conditions of the orchard experiment and with the clones used, no distinction was found between influence on tree size of any apple clone when present as the scion or when present as the rootstock. Major distinctions in influence as scion or as rootstock were, however, found in the case of certain quince and cherry clones.Evidence as to the precocity of flowering of the scions of compound trees indicates that precocity may occur independently of a dwarfing influence.     

International society for horticultural science calendar of events 1979

A study was made to induce flowering in an “off-year” in the strictly irregularly-bearing mango cultivar ‘Langra’. Cycocel 3000 mg/l on ringed shoots produced the largest number of flower panicles (62.3%), whereas the control recorded the lowest number (8%). MH-1500 mg/l with ringing reduced the length of the shoot, increased the diameter of the shoots, and greatly reduced the vegetative growth. All the treatments produced quite good percentages of flower buds in comparison to the control, and enhanced the flowering-time. With CEPA 400 mg/l the flowering-time was enhanced by 16 days.