Soil agrochemical parameters and grain quality indices change in crop rotation

A field experiment was carried out on sandy clay loam soil of the Study and Research farm Peterlauki of the Latvia University of Agriculture (LUA). The crop rotation consists of six fields with the following crop sequence: winter wheat – winter rape – spring wheat – barley – barley + clover – clover. The experiment scheme included no fertilizer treatment and nine treatments with constant potassium, four phosphorus and three nitrogen rates, what was differentiated corresponding to the demands of the growing crops. Soil samples were taken from 0 to 20 cm depth in plots before the experiment, in the middle of crop rotation and after completion of the first rotation cycle. The aim of our study was to determine the influence of crop rotation and fertilizers on the changes of soil agrochemical properties as well as grain quality indices. The obtained data showed that the tendency of decreasing soil organic matter content by 0-6.1 g kg-1 on average was still observed after the completion of full rotation cycle. Research results showed insignificant increase in soil pH values connected with parent material peculiarities and high concentration of hydrogen carbonate in soil solution. Thus, acidification in topsoil was not observed even at increased doses of single superphosphate applied. There were not observed significant changes in available phosphorus(P) and potassium (K) under the influence of fertilizer during one rotation cycle. Peculiarities of meteorological conditions during the experimental years caused greater fluctuations in grain quality than the fertilizer applied

Effect of fertilizer on soil reaction

The aim of study was to determine the influence of growing fertilizer rates on soil reaction. Soil samples were taken from experimental plots, where different amounts of NPK fertilizers were applied for perennial grasses within 6 years (1986 - 1992). The experimental design was 12 treatments in 4 replications, and established in sod-gleysolic loamy sand. Potential acidification of soil as a result of fertilization was calculated based on CaCO₃ balance and obtained results validated with the analytical tests of topsoil (0 - 20 cm) and subsoil (20 - 40 cm) reaction before and after experiment. Obtained results showed low performance of data obtained by calculation CaCO₃ balance, thereby using only CaCO₃ balance, it is risky to forecast soil acidification. In spite ofthat the used fertilizer rates changed in the widely ranges between treatments (N₀P₀K₀ - N₃₀₀P₁₂₀K₂₄₀), fertilization had not significant influence on soil reaction

Soil agrochemical parameters and grain quality indices change in crop rotation

A field experiment was carried out on sandy clay loam soil of the Study and Research farm Peterlauki of the Latvia University of Agriculture (LUA). The crop rotation consists of six fields with the following crop sequence: winter wheat – winter rape – spring wheat – barley – barley + clover – clover. The experiment scheme included no fertilizer treatment and nine treatments with constant potassium, four phosphorus and three nitrogen rates, what was differentiated corresponding to the demands of the growing crops. Soil samples were taken from 0 to 20 cm depth in plots before the experiment, in the middle of crop rotation and after completion of the first rotation cycle. The aim of our study was to determine the influence of crop rotation and fertilizers on the changes of soil agrochemical properties as well as grain quality indices. The obtained data showed that the tendency of decreasing soil organic matter content by 0-6.1 g kg-1 on average was still observed after the completion of full rotation cycle. Research results showed insignificant increase in soil pH values connected with parent material peculiarities and high concentration of hydrogen carbonate in soil solution. Thus, acidification in topsoil was not observed even at increased doses of single superphosphate applied. There were not observed significant changes in available phosphorus (P) and potassium (K) under the influence of fertilizer during one rotation cycle. Peculiarities of meteorological conditions during the experimental years caused greater fluctuations in grain quality than the fertilizer applied

Autoruzraudziba razosanas izmeginajumam ar Rigas kanalizacijas notekudenu dunu pielietosanu augsnu ielabosana agrofirma SIA "Bulduri"

Available from Latvian Academic Library / LAL - Latvian Academic LibrarySIGLEMinistry of Agriculture of the Republic of Latvia, Riga (Latvia)LVLatvi

Information society and modern business Selected proceedings of international scientific conference

Available from Latvian Academic Library / LAL - Latvian Academic LibrarySIGLEJSC Ventspils Nafta, Ventspils (Latvia); Latvian Council of Science, Riga (Latvia)LVLatvi

An overview of fertilizer-P recommendations in Europe: soil testing, calibration and fertilizer recommendations

The procedure for applying phosphorus (P) fertilizer to soil can be divided into three consecutive steps: (i) Measurement of soil-P availability, (ii) calibration of the soil-P fertility level and (iii) estimation of the recommended P dose. Information on each of these steps was obtained for 18 European countries and regions with the aim of comparing P fertilizer recommendation systems at the European scale. We collected information on P fertilizer recommendations through conventional or grey literature, and personal contacts with researchers, laboratories and advisory services. We found much variation between countries for each of the three steps: There are more than 10 soil-P tests currently in use, apparent contradictions in the interpretation of soil-P test values and more than 3-fold differences in the P fertilizer recommendations for similar soil-crop situations. This last result was confirmed by conducting a simple experimental inter-laboratory comparison. Moreover, soil properties (pH, clay content) and crop species characteristics (P responsiveness) are used in some countries in the calibration and recommendation steps, but in different ways. However, there are also common characteristics: soil-P availability is determined in all countries by extraction with chemical reagents and the calibration of the soil-P test values, and the fertilizer recommendations are based on the results from empirical field trials. Moreover, the fertilizer recommendations are nearly all based on the amount of P exported in the crops. As long as rational scientific and theoretical backgrounds are lacking, there is no point in trying to synchronize the different chemical methods used. We therefore call for a mechanistic approach in which the processes involved in plant P nutrition are truly reproduced by a single standard method or simulated by sorption-desorption models

An overview of fertilizer-P recommendations in Europe: soil testing, calibration and fertilizer recommendations

The procedure for applying phosphorus (P) fertilizer to soil can be divided into three consecutive steps: (i) Measurement of soil-P availability, (ii) calibration of the soil-P fertility level and (iii) estimation of the recommended P dose. Information on each of these steps was obtained for 18 European countries and regions with the aim of comparing P fertilizer recommendation systems at the European scale. We collected information on P fertilizer recommendations through conventional or grey literature, and personal contacts with researchers, laboratories and advisory services. We found much variation between countries for each of the three steps: There are more than 10 soil-P tests currently in use, apparent contradictions in the interpretation of soil-P test values and more than 3-fold differences in the P fertilizer recommendations for similar soil-crop situations. This last result was confirmed by conducting a simple experimental inter-laboratory comparison. Moreover, soil properties (pH, clay content) and crop species characteristics (P responsiveness) are used in some countries in the calibration and recommendation steps, but in different ways. However, there are also common characteristics: soil-P availability is determined in all countries by extraction with chemical reagents and the calibration of the soil-P test values, and the fertilizer recommendations are based on the results from empirical field trials. Moreover, the fertilizer recommendations are nearly all based on the amount of P exported in the crops. As long as rational scientific and theoretical backgrounds are lacking, there is no point in trying to synchronize the different chemical methods used. We therefore call for a mechanistic approach in which the processes involved in plant P nutrition are truly reproduced by a single standard method or simulated by sorption-desorption models