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In a study of net above-ground productivity of the economically important woody weed, S. punicea, in S. Africa, with and without the introduced monoph...Read more
Annual determinations were made of the number of viable weed seeds in the soil on plots of a 9-year experiment with vegetable crops in which four prim...Read more
The size, composition and seasonal and depth-related variations in the soil seed bank of a former chalk grassland ley were determined at monthly inter...Read more
The effects of shoot and root competition in 23 studies including additive and replacement techniques, radial and linear layouts, several of methods o...Read more
The genetic structure of agricultural plant populations has long been recognized as an important factor in their vulnerability or resistance to diseas...Read more
Observations on two burning regimes during a 3-year period in Machakos district (5200 ft. alt., rainfall 25 in./year) showed that these thickets can b...Read more
Enclosures (4.5 m3) in a dense Potamogeton pectinatus community were enriched by weekly additions of NaNO3 and KH2PO4 at four rates (max. 1000 mu g N ...Read more
Growth of P. stratiotes at the southern-most tip of the man-made Volta Lake in Ghana was measured over 1 year. Biomass and relative growth rate remain...Read more
A mechanistic physiological model for the growth of bracken has been developed which describes its yearly cycle in terms of three compartments: frond ...Read more
The weed seed populations built up in the top 6 in. of soil in land on which vegetable crops have been grown for long periods, was estimated from soil...Read more