خيارات البحث
النتائج 1 - 3 من 3
Mineral nitrogen and phosphate cycles in different crop rotations
2010
Guzys, S., Lithuanian Univ. of Agriculture, Vilainiai, Kedainiai (Lithuania). Faculty of Water and Land Management. Water Research Inst.
A current investigation compared various intensive crop rotations (Norfolk, row crops, cereals, short term grass) grown on Cambisols. The study results showed significant effects of N-fertilization of the agroecosystem on mineral N concentration in drainage water and its leaching process. The highest N concentration in drainage water and leaching was determined in the conditions of cereals and row crops rotations. No major impact of the crop rotation on phosphates concentration in drainage water was determined. The average leaching of one by drainage did not exceed 100-140 g haE-1 within a 7 year study period. An experiment was arranged during 1997-2003 years in the Kėdainiai district, Lipliunai willage. A rational and well-considered fertilization ensures high crop productivity and profitable farming as well as steady, which is the main condition for reduced non-point source pollution of water.
اظهر المزيد [+] اقل [-]The content of plant nutrients in soil and the productivity of grasslands in organic and conventional farming in Estonia
2001
Ellermaee, O. (Estonian Agricultural Univ., Tartu (Estonia). Dept. of Grassland Science and Botany) | Geherman, V.
The general purpose was to study productivity of organic grasslands and compare it with productivity at a conventional farm under the same or similar climatic and pedologic conditions. The investigation was based on field experiments that were carried out in 5 different regions of Estonia in 2000. In the current research, the DM-yield of sward (on 4 research plots of 5 square m), the botanical composition, soil pHKCL and humus content (by Tjurin) were measured. Also the content of soluble plant nutrients P and K were measured by DL-(Egner-Riehm) method and Ca and Mg- by AL- (ammonium acetate extraction) method.
اظهر المزيد [+] اقل [-][The soils in San Felipe del Progreso, Mexico State] | Los suelos del municipio de San Felipe del Progreso, Estado de Mexico
1997
Reyes Reyes, B. Gabriel
