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:Anto Mijić, Miroslav Krizmanić, Ivica Liović, Zvonimir Zdunić, and Sonja Marić
The objective of the investigation was testing of sunflower hybrids in different environmental conditions. Trials were set up at three locations (Osijek —Eastern Slavonia county, Karanac — Baranja county, and Feričanci — Western Slavonia county) during the 2002 and 2003 growing season. Fourteen sunflower hybrids were tested. Stability and adaptability analysis was performed using two parameters — regression coefficient (b
) and deviations mean square (s
). Determined were hybrids characterized by high and stable grain yield and wide general adaptability and hybrids for low and high yielding environments. The investigation showed no significant differences among single cross and three-way cross hybrids regarding grain yield stability.
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.