Authors:Mirta Rastija, Vlado Kovacevic, Marija Vrataric, Aleksandra Sudaric, and Miroslav Krizmanic
Maize and soybeans were grown under field conditions on acid soil (pH in KCl = 3.99). The field trail was conducted in spring 2004 as follows: a = ordinary fertilization, b = a + NPK-1, c = a + NPK-2, d = a + NPK-3 and e = a + NPK-4. The fertilizer NPK 10:30:20 was source of P and K (using in amounts 416, 1249, 2082, 2916 and 3748 kg/ha, for the treatments a, b, c, d and e, respectively. Nitrogen amount was equilized for all treatments by addition of adequate quatities of CAN (calcium ammonium nitrate: 27% N) were used. The experiment was conducted in four replicates. By application of the ameliorative rates of NPK fertilizer, grain yields of maize significantly increased to level of 14% compared to standard fertilization (12.33 and 14.00 t ha
, for the control and the second rate of NPK fertilization, respectively. Only the highest rate of NPK fertilizer resulted by significant increase of protein in grain. Residual response of soybean (the growing season 2005) to the fertilization was considerably higher compared to maize, because yields of soybeans were increased up to 32%. Protein contents in soybean grain were independent on the fertilization, while oil contents were increased up to 0.66% compared to the control.
Authors:Irena Jug, Danijel Jug, Vlado Kovacevic, Bojan Stipesevic, and Ivan Zugec
Soybean were grown under field conditions on chernozem soil for four growing seasons (from 2002 to 2005). Three treatment of soil tillage were applied as follows: a) conventional tillage, b) reduced tillage (diskharrowing instead of ploughing) and c) no-till (zero-tillage). In general, the characteristics of growing season (the factor „year“) were more influencing factor of soybean nutritional status (aerial part in stage of full-developed pods) in comparison with the soil tillage. In our study, low influences of applied soil tillage treatments on nutritional status of soybean were found because significant differences on soybean composition were found only for four (Cu, Cr, Sr and Ba) from total 20 analysed elements. For example, conventional tillage resulted by the higher plant Cu (by 15% and 18% in comparison with DH and NT, respectively), and the lower plant Sr (by 12% and 16%, respectively) and Ba (by 26% and 23%, respectively), while under DH conditions by 22% lower plant Cr was found. Main nutrient status (P. K, Ca, Mg, S...) were independent on soil tillage. For this reason, usual fertilization practice is recommended for possible application of soil tillage reduction under conditions of calcareous chernozem.
Authors:Marija Vrataric, Aleksandra Sudaric, Vlado Kovacevic, Tomislav Duvnjak, Miroslav Krizmanic, and Anto Mijic
Six cultivars of soybean (
(L.) Merr.) maturity groups 0 and 1 were evaluated in relation to the response to foliar fertilization with two levels of Epsom salt (ESFF) on grain yield, protein and oil content in grain. A field study conducted in Eastern Croatia during four years (1998–2001). The obtained results showed significant increasing of grain yield, protein and oil content in grain affected by ESFF. At investigated traits were non significant differences between two treatment levels. Interaction ESFF with cultivars as well as with years was significant, respectively.