Faculty of Natural and Agricultural Sciences
School of Agricultural and Food Sciences
Department of Plant Production and Soil Science
Hammes, PS
MSc(Agric) DSc(Agric)(Pret) - Professor
Contact Details
Research Interests
Research Output
Contact Details:
Telephone number: 012 420 3219
Fax number: 012 420 4120
E-mail address: piet.hammes@up.ac.za
Research Interests:
The morphology and ultrastructure of the epidermis of leaves and fruit
Epidemiology of Erwinia on potato in SA
Sustainable plant production
Soil water relations and plant water use
Research Output:
Research articles in refereed specialist journals:
Bayu WM, Rethman NFG, Hammes PS: 2005. Effects of tied-ridging, nitrogen fertilizer and cultivars on the growth, yield and nitrogen use efficiency of sorghum in semi-arid areas. Australian Journal of Experimental Agriculture, 24, pp 23-35.
Tekalign T, Hammes PS: 2005. Growth responses of potato (Solanum tuberosum) grown in a hot tropical lowland to applied paclobutrazol: 1. Shoot attributes, assimilate production and allocation. New Zealand Journal of Crop and Horticultural Science, 33, pp 35-42.
Tekalign T, Hammes PS: 2005. Growth responses of potato (Solanum tuberosum) grown in a hot tropical lowland to applied paclobutrazol: 2. Tuber attributes. New Zealand Journal of Crop and Horticultural Science, 33, pp 43-51.
Tekalign T, Hammes PS: 2005. Growth and biomass production in potato grown in the hot tropics as influenced by paclobutrazol. Plant Growth Regulation, 45, pp 37-46.
Tekalign T, Hammes PS: 2005. Growth and productivity of potato as influenced by cultivar and reproductive growth II. Growth analysis, tuber yield and quality. Scientia Horticulturae, 105, pp 29-44.
Tekalign T, Hammes PS: 2005. Growth and productivity of potato as influenced by cultivar and reproductive growth I. Stomatal conductance, rate of transpiration, net photosynthesis, and dry matter production and allocation. Scientia Horticulturae, 105, pp 13-27.
Bayu W, Rethman NFG, Hammes PS, Pieterse PA, Grimbeek RJ, van der Linde MJ: 2005. Water stress affects the germination, emergence and growth of different sorgum cultivars. SINET: Ethiopian Journal of Science, 28 (2), pp 119-128.
Bayu WM, Rethman NFG, Hammes PS: 2005. Growth and yield compensation in sorghum (Sorghum bicolor L. Moench) as a function of planting density and nitrogen fertilizer in semi-arid areas of northeastern Ethiopia. South African Journal of Plant and Soil/Suid-Afrikaanse Tydskrif vir Plant en Grond, 22 (2), pp 76-83.
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