P. V. Zaag

Publications43
h-index12
Citations378
Highly Influential Citations12
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Resistance to Pseudomonas solanacearum in the potato: II. Aspects of host-pathogen-environment interaction
SummaryHost-pathogen-environment interaction in the potato-P. solanacearum pathogenic system was investigated by testing eight true potato seed progenies and four clones for resistance to three… Expand
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Resistance to Pseudomonas solanacearum in the potato: I. Effects of sources of resistance and adaptation
SummaryF1 hybrid true potato seed progenies with multiple sources of specific resistance to Pseudomonas solanacearum and adaptation were evaluated under tropical greenhouse conditions for resistance… Expand
  • 29
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Influence of plant spacing on potato (Solanum tuberosum L.) morphology, growth and yield under two contrasting environments
SummaryIn experiments at a temperate (43oN) and a tropical (14oN) location, closer plant spacing decreased stem branching, root growth, and mean tuber size but increased tuber yields per ha. Closer… Expand
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The response of potato (Solanum spp.) to photoperiod and light intensity under high temperatures
SummaryThe growth, development and yield of seven cultivars were evaluated under field conditions with photoperiods from 11.5 to 16 hours and light intensities from full light (≧12 MJ/m2/day) to only… Expand
  • 43
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True potato seed in China: Past, present and future
China has gained recognition for its pioneer work on true potato seed (Song Bofu, 1984,Liand Shen, 1979). The history of true potato seed (TPS) in China dates back to 1959 when research was started.… Expand
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Effects of heat tolerance on expression of resistance toPresudomonas solanacearum E. F. Smith in potato
SummaryTwelve potato clones with different genetic background for resistance to bacterial wilt and adaptation were tested for resistance to a race 1 and a race 3 isolate of the pathogen at three… Expand
  • 9
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Effects of resistance genes, heat tolerance genes and cytoplasms on expression of resistance to Pseudomonas solanacearum (E.F. Smith) in potato
SummaryEffects of resistance genes and heat tolerance genes on expression of resistance to bacterial wilt caused by Pseudomonas solanacearum were investigated in 30 F1 progenies from parents with… Expand
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A promising method for screening drought tolerance in potato using apical cuttings
Ten diverse potato genotypes from apical cuttings were screened for drought tolerance in raised beds of 3:1 v/v volcanic soil:burnt rice hull medium. The object was to test whether this method could… Expand
  • 3
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An assessment of chemical properties for soils of Rwanda with the use of geostatistical techniques
Abstract Surface soil (0–15 cm) and subsoil (30–45 cm) samples from 121 locations in Rwanda were collected and analyzed for pH, soluble Si, effective CEC (ECEC), Ca, Mg, K, Na, NH 4 , Al, P and S.… Expand
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True potato seed research and development in Vietnam
Quality tuber planting material is unavailable in the Red River Delta (RRD). The use of True Potato Seed (TPS) was considered as an alternative planting material. During the 1985–86 and 1986–87… Expand
  • 12