Effect of irrigation method on the recovery of  15N fertilizer in a slowly permeable clay soil cropped with maize

Mosier, A. R.; Meyer, WS; Melhuish, FM

doi:10.1071/sr9860001

Cited by 10 publications

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“…4) 8 mm on DAS 4 and 5 ( Fig. 1) and high mineral N provided conditions suitable for denitrification (Mosier et al, 1986). The apparent loss of 1.9gNm : represents 38% of the fertilizer N applied at sowing to treatment Ns0.…”

Section: Resultsmentioning

confidence: 99%

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Fertilizer and soil nitrogen accumulation by irrigated barley grown on a red-brown earth in south-eastern Australia

Smith

Gyles

1989

Plant Soil

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Abstract~SN labelled (NH4)2504 was applied to barley at 5 g N m -2 (50 kg N ha-~ ) in microplots at sowing to study the timing of the N losses and the contribution of soil and fertilizer N to the plant. Water treatments included rainfed and irrigation at 45-50 mm deficit beginning in the spring.Recovery of ~SN in the plant increased to a maximum of about 20% within 91 days after sowing (DAS 91) and then remained constant. Approximately 16% (0.8 gN m -2) of the fertilizer was in the stem and leaves at DAS 91 and this N was subsequently redistributed to the head. At maturity, approximately 75% of the ~SN assimilated by the tops was recovered in the grain. Soil N contributed 3.6gNm -2 to the head; 2.2gNm -2 was remobilized from the stem and leaves, and the balance, approximately 1.4gNm -2, was taken up from the soil between DAS 69 to 91. Effects of irrigation treatments on N accumulation were not significant.Residual JSN fertilizer in the soil decreased with time from sowing, and at maturity 40% of the applied N was recovered in the surface 0.15 m. ~SN movement to depth was limited and less than 5% of the fertilizer was recovered below 0.15 m. Irrigation had no effect on the LSN recovery at depth.Total recovery of the 15N varied between 60 and 67% and implies that 33-40% was lost from the soil-plant system. The total recovery in the soil and plant was not affected by time or irrigation in the interval DAS 39 to 134. Losses occurred before DAS 39 when crop uptake of N was small and soil mineral N content was high. There was an apparent loss of 1.9 g fertilizer Nm -2 (i.e. 38% of that applied) between DAS 1 and 15.This loss occurred before crop emergence when rainfall provided conditions suitable for denitrification.

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Section: Resultsmentioning

confidence: 99%

“…The common flood irrigation practice, where the surface soil is inundated with water frequently causes waterlogging and anaerobiosis (Mosier et al, 1986). These factors are conducive to high rates of N loss by denitrification and may produce an N limitation for plant growth and yield.…”

Section: Introductionmentioning

confidence: 99%