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Effects of Nitrogen Fertilization on Manganese Concentration and Yield of Barley and Oats¹

ABSTRACT

Response of barley (Hordeum vulgare L.) and oats (Avena sativa L.) to band application of N sources with and without Mn and the effects of band vs. broadcast application of fertilizers on the Mn concentration in leaves and yield of barley and oats were studied in the field in 1978, 1979, and 1980 on Lower Klamath Lake where Mn deficiency of oats had been observed in previous years. Experiments were established on a Tulana silt loam variant (medial, nonacid, mesic, Mollic, Andequepts). The pH of the soils ranged from 7.6 to 8.3 and the organic matter content was between 17 and 19%. Nitrogen was applied at 0, 22, or 45 kg N/ha as (NH₄)₂SO₄, NH₄Cl, urea, and various urea-phosphate (UP) formulations. Manganese was applied at 0 or 5.6 kg Mn/ha as MnSO₄. All treatments received P at 19 kg P/ha as Ca(H₂PO₄)₂ or 25 kg P/ha in the UP fertilizers, and Cu as CuSO₄ at 2.2 kg Cu/ha in 1978 and 5.6 kg Cu/ha in 1979 and 1980. ‘Cayuse’ oats and ‘Steptoe’ barley were planted at 110 kg/ha. Band application with the seed of 22 or 45 kg N/ha as (NH₄)₂SO₄ or NH₄Cl significantly increased both barley and oat leaf Mn concentrations and yields all 3 yr. Leaf Mn concentrations and yields were not increased by urea fertilization. When Mn was applied with the N fertilizer, leaf Mn concentrations and yields were similar regardless of N source. Broadcast application of fertilizers did not increase leaf Mn concentration or yield. The UP materials were intermediate in effectiveness between urea and (NH₄)₂SO₄.

¹ Oregon Agric. Exp. Stn. Technical Paper no. 6429. Contribution of the Dep. of Soil Science, Oregon State Univ. The authors wish to acknowledge financial assistance from the Div. of Agric. Development, National Fertilizer Center, TVA, Muscle Shoals, AL.

² Formerly Graduate Research Assistant, Dep. of Soil Science, Oregon State Univ., now Extension Soil Fertility Specialist, Univ. of Idaho, Twin Falls Research and Extension Center, Twin Falls, ID 83301; and Professor, Dep. of Soil Science, Oregon State Univ., Corvallis, OR 97331, respectively.

Received for publication June 28, 1982. Accepted for publication November 21, 1983.