Journal of Horticultural Science 

About: Journal of Horticultural Science is an academic journal. The journal publishes majorly in the area(s): Shoot & Rootstock. Over the lifetime, 3880 publications have been published receiving 52356 citations.

Use of the Boundary Line in the analysis of biological data

Abstract: SUMMARYA new approach to the study of crop productivity has been developed in which the performance of the best in the sample examined is taken as a standard against which to judge the remainder, on the assumption that there are reasons other than chance which account for the inferior performance of part of the population.The line defining the best performance in the population lies at the edge of any body of data, hence the name 'Boundary Line', and occurs wherever a cause-and- effect relationship exists between two variables. When the best performance can be quantified, the overall deficiency in yield due to inferior performance can be assessed and the magnitude of the shortfall used in deciding if investigations to increase yield are justified. When it is allied to a knowledge of the components of yield, the position of the Boundary Line can be used to direct attention to phases of growth most likely to respond to better management.

The effects of salinity on dry matter partitioning and fruit growth in tomatoes grown in nutrient film culture

Abstract: SummaryTomato plants were grown from three successive sowings in nutrient film culture at different salinities. When the electrical conductivity of the nutrient solution was in the range of 2,4 and 6 mS neither the total plant dry weight nor the proportional distribution of dry matter into fruit (52%), vegetative shoot (44%) and roots (4%) was affected. However, when the conductivity was 10 mS total plant dry weight was reduced by 19% of that at 2 mS, although the proportional partitioning of dry matter into various organs was still unaffected. The proportion of total plant weight in fruit was only reduced slightly at 17 mS. The effects of salinity on fruit growth were investigated for seven weeks beginning seven days after anthesis. The increase in fruit fresh weight was markedly reduced by high solution conductivities (12 and 17 mS) and the fresh weight of mature fruit grown at 17 mS was 40% less than that of fruit grown at 2 mS. In contrast, the dry matter accumulation by individual fruit was not affec...

The influence of shading on yield of glasshouse tomatoes

Abstract: The proportion of solar radiation incident on plants of four tomato cultivars grown as long-season, layered crops in heated glasshouse compartments was reduced by either 6.4% (light shade) or 23.4% (heavy shade); all other environmental variables were kept the same. The two shade treatments reduced the total fresh weight yield of fruit by 7.5 and 19.9% and the estimated total above-ground biomass by 6.2 and 16.5%, respectively.Over the first 14 weeks of harvest (February to May), yield was accumulated in direct proportion to solar radiation receipt and, regardless of treatment, 2.01 kg fresh weight of fruit were harvested for every 100 MJ of solar radiation incident on the crops from the onset of harvest. Later, the net incident solar radiation was apparently used more efficiently, especially under heavy shade. Furthermore, from February to May, the yield produced in each successive two-week period was proportional to the solar radiation incident on the crop in the preceding 10 weeks; the average duration...

Effects of increasing the salinity of the nutrient solution with major nutrients or sodium chloride on the yield, quality and composition of tomatoes grown in rockwool

Abstract: SummaryTomato plants grown in rockwool at a salinity of 3 mS cm-1 were compared with those at 8 and 12 mS cm-1, where the higher salinities were achieved by addition of either major nutrients (N03-N, K and Ca) or NaCl. Increasing the salinity progressively reduced the yield of fruit (fresh weight) but increased the proportion graded as high quality (Class 1). Similar responses to both sources of salinity were obtained at 8 mS cm-1. The number of fruit produced, the dry weight per fruit and their reducing sugar content (g per fruit) were decreased at 12 mS cm-1. Added major nutrients affected vegetative growth adversely at 12 mS cm-1, and reduced the size, dry weight and sugar content of the fruit as compared with NaCl. At both 8 and 12 mS cm-1, the acidity of the fruit juices was higher with added major nutrients than with NaCl, as was the total acid content per fruit. Whilst the data are consistent with a specific role of K in controlling fruit acidity, they show that much of the increased acidity of the...

Stress physiology: the functional significance of the accumulation of nitrogen-containing compounds.

Abstract: A number of nitrogen-containing compounds (NCCs) accumulate in plants subjected to environmental stress. Numerous books and review articles dealing with the effects and consequences of environmenta...