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991.
Four potato varieties were subjected to water stress under controlled conditions. Leaf relative water content, leaf diffusive resistance, and photosynthesis were measured on stressed and unstressed plants during a stress period and during the recovery period following stress relief. Subsequent to the stress, plants were grown to maturity with optimal water supply. Mature plants were harvested and tuber yield and haulm production measured. Stressed plants of all varieties exhibited an increase in leaf diffusive resistance and a decrease in relative water content, transpiration, and photosynthesis as soil moisture decreased. Significant varietal differences in leaf diffusive resistance of stressed plants are apparent and offer promise for development of a screening technique for varietal sensitivity to drought based on stomatal response to water deficits. 相似文献
992.
Summary Trials were carried out in 1984, 1985 and 1986, on a sandy loam soil with an average content of 133 mg/l available potassium
in which the effect of source (KCl, K2SO4) and rate (0, 300, 600, 900 kg K2O/ha) of potassium fertilizer on yield, tuber size, dry matter, reducing sugar, fry test colour and finish fried quality was
examined for two cultivars (Pentland Dell, Maris Piper).
The results indicate a strong influence of cultivar on all measured characters, the rate of potassium fertilizer also gave
significant changes in quality and yield and there were significant year effects. The effect of source of potassium was not
significant. 相似文献
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994.
Richard N. Arteca B. W. Poovaiah L. K. Hiller 《American Journal of Potato Research》1980,57(6):241-247
Electron microprobe and neutron activation analysis were used to evaluate the distribution of elements within potato tubers having the physiological disorder hollow heart. Both methods of analysis correlated well for all elements tested. In hollow heart tubers, there were significantly higher Ca++ levels in the stem end than in the bud end; however, a Ca++ gradient in the control was not evident. The stem to bud end ratios for Ca++ were highest in the hollow heart tubers. A Cl? gradient from stem to bud end was obvious in both the hollow heart and control tubers. In the control tubers, K+ was highest in the bud end and lowest in the stem end. There was no K+ gradient in hollow heart tubers, but in the area adjacent to the hollow it was higher than at both ends. 相似文献
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Landscape Ecology - Soil heterogeneity versus homogeneity patterns are observed within and across urban landscapes at multiple scales. To fully evaluate human-mediated influences on soil properties... 相似文献