By Thomas J. Monaco
This publication offers an excellent heritage to coping with weeds. in spite of the fact that, it does specialize in administration in crop lands. there's first-class info on many alternative administration concepts from mechanical keep an eye on to using herbicides. Many chapters also are dedicated to the organic mechanisms that make herbicides potent. For someone attracted to recovery and weed administration in noncrop lands, this ebook is probably not well worth the funds. you may get many of the similar details off herbicide labels and the net.
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Other seeds have cottonlike lint or similar structures that help them cling to fur or clothes. Annual bluegrass and bermudagrass seed will stick to the fur of rabbits and dogs. Mistletoe seeds are sticky and become attached to the feet of birds. Birds often carry away fleshy fruits containing seeds for food. TABLE 2-3. Germination of Weed Seed After Storage in Fresh Water Field bindweed Canada thistle Russian knapweed Redroot pigweed Quackgrass Barnyardgrass Halogeton Hoary cress After 54 months, 55% germinated.
In terms of the influence on reducing the number of weed seeds in the soil, some argue that the only acceptable threshold is zero and others maintain that a zero threshold is unrealistic. , 1992. In addition to the generation of weed thresholds, a considerable amount of recent research on weed–crop competition involves the development of computer models to assist growers and advisers in making weed management decisions. Several models have been developed and are being used in weed management decision making for several crops.
The amount of moisture contained in seeds may determine their respiratory rate. During germination the seed respires at a very rapid rate. Many seeds cannot maintain this high rate of respiration until they reach a moisture content of 14% or more. Thus, in dry soils the seed remains dormant. Dry seeds can tolerate severe conditions; some have been kept in boiling water for short intervals without injury and others in liquid nitrogen (–310°F). When moist enough for germination, the same seeds may be killed by cold temperatures of 30°F or warm temperatures of 105°F.