Komamura, K., Suzuki, A., Fukumoto, M., Kato, K. and Sato, Y. (2000) Effects of Long-Term Nitrogen Application on Tree Growth, Yield, and Fruit Qualities in a “Jonathan” Apple Orchard. Journal of the Japanese Society for Horticultural Science, 69, 617-623.
http://dx.doi.org/10.2503/jjshs.69.617

has been cited by the following article:

• TITLE: Physical and Biochemical Properties of Apple Orchard Soils of Different Productivities

  AUTHORS: Takamitsu Kai, Masaki Mukai, Kiwako S. Araki, Dinesh Adhikari, Motoki Kubo

  KEYWORDS: Apple Orchard Soil, Physical Properties, Biochemical Properties, Fruit Yield

  JOURNAL NAME: Open Journal of Soil Science, Vol.5 No.7, July 13, 2015

  ABSTRACT: Physical and biochemical properties of apple orchard soils of different productivities (orchard A: 30 t·haǃ orchard B: 20 t·haǃ) were analyzed. Most of the physical properties were similar in both orchards. In orchard A, the horizontal saturated hydraulic conductivity at 10-cm depth was 16.42 cm·dayǃ, and was about four times higher than that in orchard B (4.41 cm·dayǃ). Total carbon, total nitrogen, and total phosphorus were about two times higher in orchard B soil, whereas total potassium, bacterial biomass, nitrification, and phosphorus mineralization activities were similar in both orchards. Excess nutrients accumulated on the top 15 cm layer of orchard B soil because the topographical and physical conditions were associated with reduced apple productivity. Appropriate management of fallen leaves and reduction of chemical fertilizer seem necessary for a high level of apple productivity.