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Current concerns about soil and water quality deterioration, limited possibility of fossil fuels, loss of biodiversity, and in general the viability of rural communities urge to work out methods of sustainable agriculture in the Nyírség region of Hungary. Sustainable agriculture seeks solutions for environmental, economic and agricultural problems at the same time. The aim is to develop new production methods which provide the protection of nature. In sustainable agricultural systems the management of organic matters and, more widely, the whole nutrient management are based on the total self-sufficiency of the farm. The entire cycle of organic matter production and decomposition takes place within the farm boundaries and makes the farm an actual biological system. The rate of metabolism and the organic matter cycle are characteristic features of each farm and define their activity for a long time. Present investigation conducted in Westsik's crop rotation experiment has found a highly significant correlation between organic nitrogen extracted by 0.01 M CaCl 2 solution and potato yield. It has shown that soil organic nitrogen extracted by 0.01 M CaCl 2 solution is a reliable indicator of nitrogen available for mineralization during the growing season. When precise nitrogen fertilizer recommendations are required, the method can supply additional information for environmentally friendly, sustainable agriculture.

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fertilizer rates in a vegetable crop rotation. Bulg. J. Agric. Sci. , 8 , 141–150. Raikova L. Ecological assessment of different nitrogen fertilizer rates in a vegetable crop

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By using slow damped oscillations of a torsional pendulum, it is possible to determine the mass adsorbed on the surface of a porous sorbent without buoyancy effects from the frequency and the logarithmic decrement of the pendulum motion. In principle, it is then possible to determine directly the buoyancy-related volume Vas of the sorbent/sorbate system by combining the results with gravimetric measurements. Measurements with a preliminary testing pendulum are presented for N2 and CH4 on the activated carbon Norit R1 Extra at ambient temperature in the pressure range 0<p<0.5 MPa. Values for Vas calculated from these measurements and gravimetrically determined data are presented and discussed to a certain extent.

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Cereal Research Communications
Authors: Saber Golkari, Jeannie Gilbert, Kirsten Slusarenko, W. Fernando, and Anita Brûlé-Babel

This study identified Fusarium spp. naturally occurring on field stubble. Throughout the 4 years of sampling, seven Fusarium species were isolated from crop stubble. In 2002 and 2003 only the stubble of foundation crops of wheat and oat were colonized by Fusarium spp; low levels were isolated from pea and canola stubble in 2005 and 2006. No consistent pattern of colonisation was observed, suggesting that airborne inoculum, susceptibility of wheat to FHB, and favorable environmental conditions are important factors in epidemics.

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