Record ID No. |
852 |
Author(s) |
Panja,B.N., Chaudhuri,S , 2005 |
Affiliation |
Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Kalyani 741 235, Nadia, West Bengal, India. |
Title |
Effect of crop rotation on arbuscular mycorrhizal inoculum build up and infectivity status of soil |
Source. Vol.(no):Page |
Journal-of-Mycopathological-Research. 43(2):189-194p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Soil plant relations |
Sub-subjects |
Cropping effect |
Host |
Cajanus cajan, Zea mays, Triticum aestivum |
Organism |
AMF |
Country |
India, Asia |
Abstracts |
The effects of crop rotation on the native arbuscular mycorrhizal (AM) inoculum build up, infectivity status of soil and root infection intensity were determined in a field experiment conducted in West Bengal, India during 1998-2000 using pigeon pea cv. TAT-10, wheat cv. UP-262 and maize cv. Vijay Composite grown during the kharif, rabi and pre-kharif, respectively. The crops were grown in single, double and triple crop sequences with weeded (i.e. clean) fallow during no-crop season in 7 treatment combinations. Weeded and non-weeded fallow were kept as 2 separate control treatments. AMF spore population in soil increased significantly with all crops and crop sequences compared to weeded fallow treatment. The mean spore number of soil after 2 years was highest with triple cropping and lowest with weeded fallowing. Non-weeded fallow treatment gave significantly higher spore number for 6 consecutive seasons than any of the single crop sequences and also 2 of the double crop sequences (pigeon pea-weeded fallow-maize and weeded fallow-wheat-maize). Wheat in the rabi season gave the highest significant increase in spore number and maize during the pre-kharif season gave the least, except when it followed wheat in either double or triple crop sequences. Mycorrhizal infectivity status of the soil in different crop sequences, and in weeded and non-weeded fallow treatments showed a similar trend in terms of mycorrhizal spore number. High rainfall during the pre-kharif season was associated with lower spore number and consequent lower infectivity status of the soil after single cropping with maize. Root infection intensity of crops and native weeds was highest during the rabi season and lowest during the pre-kharif season. Wheat as a mycorrhiza responsive crop during the rabi season significantly improved the mycorrhizal spore build up and infectivity status of the soil but weeded fallowing even for a single season may drastically reduce the observed effect. Maize, in spite of being mycorrhiza responsive, failed to stimulate AMF spore development most likely due to high soil moisture status during the pre-kharif season. |