The effect of soil pH and nitrogen rates on spring barley productivity
2001
Hejnak, V. | Hnilicka, F. | Novak, V. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic). Agronomicka Fakulta) | Lippold, H.
The effect of soil pH and nitrogen fertilization (0, 85, 170 and 255 mg N per pot, i.e. 30, 60 and 90 kg N/ha) on the productivity of spring barley, cv. Jubilant, has been studied in small-plot field trials. On extremely acid soil the studied parameters did not reach the values found on neutral soils at all levels of nitrogen nutrition and under the given conditions (humus content 1.7 to 2.8 %, Ntot = 0.20 to 0.29 %, high to very high supply of available phosphorus, suitable to good supply of available potassium and low to suitable supply of available magnesium). All N levels were efficient on neutral soil and the yield was slightly increasing on extremely acid soil only at the levels up to 60 kg N/ha. Correlation index (r) between nitrogen uptake by harvest and the straw and grain yields was high (0.74-0.82) on neutral soil, but only (0.48-0.56) on acid soil. Blockage of nitrogen supply from extremely acid soil medium became a limiting factor of yield formation. A year had a significant influence on the formation of yield parameters. Unfavourable weather conditions became a limiting factor of barley growth and yield on neutral soil and low pH value on extremely acid soil.
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