Naslov
Response of maize and barley to ameliorative fertilization

Autori
Kovacevic, Vlado ; Rastija, Mirta ; Banaj, Djuro

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of 3^rd International Symposium on Phosphorus Dynamics in the Soil-Plant Continuum / Alves M. C. Vera - Sete Lagoas : Embrapa Milho e Sorgo, 2006, 167-168

Skup
3^rd International Symposium on Phosphorus Dynamics in the Soil-Plant Continuum

Mjesto i datum
Uberlândia, Brazil, 14.05.2006. - 19.05.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
maize ; barley ; phoshorus fertilization ; yield ; ear-leaf composition

Sažetak
Two identical field experiments were set up on two soils (Luzani and Kobas localities) at the beginning of April 2001. Increased rates of P and K fertilizers were applied in the experiments: a) control (standard fertilization) ; b) a + 1500 kg P2O5 ha-1 ; c) a + 1500 kg K_2O ha-1 ; d) = b + c. Phosphorus was applied as monoammonium phosphate (MAP: 12% N + 52% P_2O_5) and potassium as KCl. Urea (46% N) was used to equalize N levels added by MAP. Residual effects of the fertilization were tested in the following growing season (2002) and standard fertilizer rates were applied (kg ha-1: 177 N + 100 P_2O_5 + 150 K_2O). The field trials were performed in four replicates. The size of the experimental fertilization plot was 64.3 m^2. The field experiment with three rates of P fertilization was conducted in spring 2003 on Okucani hydromorphic soil. P was added as monoammonium phosphate (MAP: 52% P_2O_5 and 12% N). N was equalized for all treatments by addition of correspondingly rates of CAN (calcium ammonium nitrate: 27% N). Maize was grown for the 2003 growing season. In the next year we tested residual influences of P on winter barley (cultivar Lord) properties. The total amounts individual elements in maize (the ear-leaf at sliking stage) and barley (grain) were determined after their microwave digestion by concentrated HNO_3+H_2O_2. Plant analyses were made by Jobin-Yvon Ultrace 238 ICP-OES spectrometer. Maize growing on the Luzani soil resulted in 15% lower yield compared to the Kobas soil. Fertilization with P and P in combination with K resulted in yield increases of 5% and 9%, respectively. However, the leaf P was dependent only on the fertilization and it is increased by 25% and 14%, for P and PK treatment, respectively. Growing season had significant influences on the leaf Mn (60% lower in 2002 compared to 2001) and the leaf Zn (14% lower in 2001 compared to 2002). Maize grown in the Luzani trial had by 9% lower the leaf Zn and by 37% higher the leaf Mn compared to the Kobas trial. Under the influence of P fertilization, the leaf Zn decreased by 37% compared to the control. Application of both P and K resulted in decreases of leaf Zn by 30%. However, P fertilization, alone or in combination with K, increased the leaf Mn for 111% and 72% respectively. Although applied fertilization mainly considerable and significantly influenced on these nutrients status, they were all cases in normal levels. Ameliorative P fertilization significantly increased grain yields of barley up to 25% in comparison with the control, while protein and starch contents were independent on the fertilization. In general, grain composition differences among applied treatments were mainly non-significant because significant differences only for P and Mn (increasing trend due to P application) as well as for Zn and Mo (decreasing trend) were found.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA