Record ID No. |
856 |
Author(s) |
Garcia-de-Salamone,I.E., Michelena,R., Rodriguez,A., Montemitoli,I., Gatti,S., Rorig,M , 2006 |
Affiliation |
Catedra de Microbiologia Agricola, FAUBA, Av. San Martin 4453, (C1417DSE) Caba, Argentina. |
Title |
Occurrence of mycorhiza in plants of maize, soybean and wheat under no-tillage systems |
Source. Vol.(no):Page |
Revista-de-la-Facultad-de-Agronomia-Universidad-de-Buenos-Aires. 26(1): 67-72p. |
Categories |
Mycorrhiza General |
Subjects |
Soil plant relations |
Sub-subjects |
Cropping effect |
Host |
Zea mays, Glycine max, Triticum aestivum |
Organism |
Mycorrhiza |
Country |
Argentina, S. America |
Abstracts |
Roots of three depths of maize, soyabean and wheat plants grown onto a Vertic Argiudoll and an Enteric Haplustoll were sampled at flowering. Total length (LRT), mycorrhized (LRM) roots and percentage of natural mycorrhiza (PM) were determined. Additionally, two greenhouse experiments were performed to determine the effects of predecessor crop (PC) and P fertilizer on PM, aerial (PSA) and root (PSR) dry weights. The treatments used in the study were based on PC and P fertilizer, and the test crops were maize and soyabean, including a non-cultivated soil. The LRT of maize roots in field conditions at 0-10 cm of depth was significantly higher than those determined at the two depths, but PM were similar. No differences were found among depths for LRT, LRM and PM of soyabean. PM was higher for wheat than for maize and soyabean. However, LRT of maize was two and three times higher than the LRT of wheat at the top and subsoil layers, respectively. Soyabean data were always placed at the intermediate level. PM of maize after soyabean with P addition was highest but without P, the highest PM values were obtained by maize after maize. At both P levels, the PM of maize and soyabean grown onto non-cultivated soil were significantly lower than those obtained for plants grown in soils. Results showed that PM could be significantly modified by historical and present soil management practices. PC and P fertilizer are tools that can be easily considered by the farmers to contribute to increase PM. Knowledge of mycorrhizal dynamics through the crop sequence can help to understand better these interactions, which collaborate to maintain agroecosystem sustainability. |