NDLI: Effects of nitrogen fertilization of grapefruit trees on soil acidification and nutrient availability in a Riviera fine sand

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Effects of nitrogen fertilization of grapefruit trees on soil acidification and nutrient availability in a Riviera fine sand

Content Provider	Semantic Scholar
Author	He, Zhenli Alva, Ashok K. Calvert, David V. Li, Yong Chun Banks, Donald J.
Copyright Year	2004
Abstract	Nitrogen (N) fertilizer applied in the NH4+ form results in some degree of soil acidification, which could influence nutrient availability to plants and nutrient losses through leaching. Effects of various N rates (0 – 168 kg N ha-1 yr-1) on soil acidification and nutrient availability were investigated in a Riviera fine sand with 26-year-old white Marsh grapefruit (Citrus paradisi MacFadyen) trees. Soil pH significantly decreased with increasing NH4–N rates. Application of 112 kg N ha-1 yr-1 for four years decreased the pH by 0.7 to 1.7 unit. Soil acidification was greater when the NH4+ form of N fertilizer was applied as dry soluble granular material compared to fertigation or controlled release forms. The marked effect of NH4–N fertilization on the pH of the Riviera fine sand was due to its low buffering capacity. Soil acidification increased the concentration of extractable Fe and P but decreased that of K, Zn and Mn. Soil pH was positively correlated with concentration of Ca, but negatively with concentrations of Fe, Mn and Zn in six-month-old spring flush leaves of the grapefruit trees. Leaf P concentrations, however, were poorly correlated with soil pH. This study also demonstrated an increase in leaching of P and K below the grapefruit trees rootzone with a decrease in soil pH.
Starting Page	11
Ending Page	19
Page Count	9
File Format	PDF HTM / HTML
DOI	10.1023/A:1004364805789
Volume Number	206
Alternate Webpage(s)	https://irrec.ifas.ufl.edu/irsws/history%20publications/2/he_alva_p&s_1999.pdf
Alternate Webpage(s)	https://doi.org/10.1023/A%3A1004364805789
Journal	Plant and Soil
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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