The effect of soil temperature, moisture and nitrogen on Striga asiatica (L.) Kuntze seed germination, viability and emergence on sorghum (Sorghum bicolor L. Moench) roots under field conditions

Osman, M.A. and Raju, P.S. and Peacock, J.M. (1991) The effect of soil temperature, moisture and nitrogen on Striga asiatica (L.) Kuntze seed germination, viability and emergence on sorghum (Sorghum bicolor L. Moench) roots under field conditions. Plant and Soil, 131 (2). pp. 265-273.

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Abstract

Striga seeds contained in nylon bags and buried at 2 cm in the soil, were exposed to different temp. and moisture treatments. Clear polythene, hay mulch and bare soil treatments were used to vary soil temp. giving mean max. temp. of 60°, 48° and 37°C, resp. Irrigation levels of 0, 30 and 60 mm were applied to change soil moisture. After 34 d of preconditioning, the exhumed Striga seeds from polythene-covered plots (solarized plots) did not germinate or retain viability when these seeds were exposed to sorghum root exudate. However, seeds similarly buried under hay mulch or bare soil had similar germination and viability rates. Of these, 75% germinated and 85% were viable, regardless of the temp. treatment. Although seeds stored at high temp. and humidity (solarization) were killed, more Striga plants emerged under the polythene treatment compared to hay mulch and bare soil treatments. The observed Striga plants in the polythene mulch treatment were, therefore, assumed to have come from deeper layers where solarization was not effective. Irrigation treatments did not have significant effects on Striga seed germination and viability, but a slightly higher number of plants emerged at 60 mm irrigation level than at 30 mm and 0 mm. Striga emergence, on the other hand, was directly related to the rate of N application. Nitrogen rates of 0, 25, 50 and 100 kg/ha resulted in the emergence of 11, 34, 38 and 40 Striga plants/plot, resp. Despite the high infestation at high N levels, sorghum plants did not show a loss of vigour.

Item Type: Article
Author Affiliation: International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India.
Subjects: Plant Protection > Pesticides
Plant Protection > Pests
Soil Science and Microbiology > Soil Sciences
Divisions: Sorghum
Depositing User: Mr B Krishnamurthy
Date Deposited: 12 Dec 2010 22:32
Last Modified: 29 Dec 2010 19:51
Official URL: http://dx.doi.org/10.1007/BF00009458
URI: http://eprints.icrisat.ac.in/id/eprint/979

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