Author

P. S. Hammes

Observed names: Hammes, P.S., P. Hammes, P.S. Hammes, P?S Hammes, PS Hammes, Piet S. Hammes

Observed institution: University of Pretoria

OpenAlex ID: A5077684271

Growth and productivity of potato as influenced by cultivar and reproductive growth

2005 · T. Tekalign, P.S. Hammes · Scientia Horticulturae · 135

Differences in salinity tolerance for growth and water‐use efficiency in some amaranth (Amaranthus spp.) genotypes

2006 · E. N. Omamt, P. S. Hammes, et al. · New Zealand Journal of Crop and Horticultural Science · 133

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Effects of Farmyard Manure and Inorganic Fertilizers on Sorghum Growth, Yield, and Nitrogen Use in a Semi-Arid Area of Ethiopia

2006 · W. Bayu, N. F. G. Rethman, et al. · Journal of Plant Nutrition · 133

The origin and structure of adventitious roots in sweet potato ( Ipomoea batatas )

2004 · T. Belehu, P. S. Hammes, et al. · Australian Journal of Botany · 76

The Role of Animal Manure in Sustainable Soil Fertility Management in Sub-Saharan Africa: A Review

2005 · W. Bayu, N. F. G. Rethman, et al. · Journal of Sustainable Agriculture · 72

Interactive effects of salinity and water stress on growth, leaf water relations, and gas exchange in amaranth (Amaranthus spp.)

2006 · E.N. Omami, P.S. Hammes · New Zealand Journal of Crop and Horticultural Science · 63

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Control mechanisms in the tuberization process

1975 · P. S. Hammes, P. C. Nel · Potato Research · 62

Growth and productivity of potato as influenced by cultivar and reproductive growth

2005 · T. Tekalign, P.S. Hammes · Scientia Horticulturae · 60

Response of potato ( Solarium tuberosum ) tuber yield components to gel‐polymer soil amendments and irrigation regimes

2007 · B. K. Eiasu, P. Soundy, et al. · New Zealand Journal of Crop and Horticultural Science · 56

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Response of potato grown under non-inductive condition paclobutrazol: shoot growth, chlorophyll content, net photosynthesis, assimilate partitioning, tuber yield, quality, and dormancy

2004 · T. Tekalign, P.S. Hammes · Plant Growth Regulation · 52

Growth and biomass production in potato grown in the hot tropics as influenced by paclobutrazol

2005 · T. Tekalign, P.S. Hammes · Plant Growth Regulation · 46

Application of Farmyard Manure Improved the Chemical and Physical Properties of the Soil in a Semi-Arid Area in Ethiopia

2006 · W. Bayu, N. F.G. Rethman, et al. · Biological Agriculture & Horticulture · 42

Net photosynthetic rate of potato at high temperatures

1990 · P. S. Hammes, J. A. De Jager · Potato Research · 37

Yield response of potato genotypes to different soil water regimes in contrasting seasons of a subtropical climate

1998 · J. M. Steyn, H. F. Du Plessis, et al. · Potato Research · 33

Localization of the photoperiodic perception in potatoes

1973 · P. S. Hammes, E. A. Beyers · Potato Research · 32

Effect of Solution pH and Calcium Concentration on Germination and Early Growth of Groundnut

2003 · M. R. Murata, P. S. Hammes, et al. · Journal of Plant Nutrition · 27

Growth responses of potato ( Solanum tuberosum ) grown in a hot tropical lowland to applied paclobutrazol: 1. Shoot attributes, assimilate production and allocation

2005 · T. Tekalign, P. S. Hammes · New Zealand Journal of Crop and Horticultural Science · 24

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Growth responses of potato ( Solanum tuberosum ) grown in a hot tropical lowland to applied paclobutrazol: 2. Tuber attributes

2005 · T. Tekalign, P. S. Hammes · New Zealand Journal of Crop and Horticultural Science · 22

Pelleting or Priming Seed with Calcium Improves Groundnut Seedling Survival in Acid Soils

2008 · M. R. Murata, G. E. Zharare, et al. · Journal of Plant Nutrition · 21

Growth and yield compensation in sorghum (Sorghum bicolorL. Moench) as a function of planting density and nitrogen fertilizer in semi-arid areas of northeastern Ethiopia

2005 · Wondimu Bayu, N. F.G. Rethman, et al. · South African Journal of Plant and Soil · 19

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Effects of cultivar and soil fertility on grain protein yield, grain protein content, flour yield and breadmaking quality of wheat

1999 · L?A Metho, J?R?N Taylor, et al. · Journal of the Science of Food and Agriculture · 19

Interaction between cultivar and soil fertility on grain yield, yield components and grain nitrogen content of wheat

1997 · Lewis A. Metho, P. S. Hammes, et al. · South African Journal of Plant and Soil · 17

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The effect of stem population on tuber yield in a trial with single-stem seed pieces

1985 · P. S. Hammes · Potato Research · 17

Effect of temperature, soil moisture content and type of cutting on establishment of sweet potato cuttings

2004 · T. Belehu, P. S. Hammes · South African Journal of Plant and Soil · 16

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Organographic and anatomical evidence that the edible storage organs of Plectranthus esculentus N.E.Br. (Lamiaceae) are stem tubers

2003 · J. Allemann, P.J. Robbertse, et al. · Field Crops Research · 16

Works count: 78

Citation count: 1,471

H-index: 19

I10-index: 36