Nitrogen Balance in a Citrus Orchard1
- S. Dasberg,
- Y. Erner and
- H. Bielorai2
Differential fertilizer and irrigation applications were utilized to assess the N balance over a period of 4 yr in a typical mature ‘Shamouti’ orange (Citrus sinensis L.) grove located in the coastal plain of Israel. Nitrogen inputs in fertilizer and irrigation water were 100, 180, and 310 kg ha−1 annually for the three main treatments. The N removed by the crop was measured by yield and N content determinations in the fruits; the leached N was measured by sampling below the root zone. It was found that the amount of leached N was similar in the low and medium N applications (< 50 kg N ha−1). At the high N application, > 50 kg N ha−1 was leached and large amounts of N were unaccounted for (approximately 100 kg N ha−1). Analysis of published data on N losses from citrus orchards showed similar large amounts of N not found in the fruit or in the soil mineral N pool after large N applications. The possible pathways for these N losses were discussed. It was concluded that this excess N was either incorporated in the soil organic matter or stored in the tree rather than being denitrified.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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