ISSN:
1573-5036
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary The absorption of N from foliar applications of various N sources by pine seedlings was studied under greenhouse conditions. Needles dipped into solutions of 4,000 ppm N from Ca(NO3)2 were burned slightly at the tips at two weeks. Although higher concentrations of (NH2)2CO and (NH4)2SO4 could be used without plant damage, a uniform concentration of 3,000 ppm was used in all comparative tests of sources. The level of tissue N, brought about by soil fertilization 6 weeks previously, did not significantly influence absorption of foliarly applied N15. Soil moisture maintained at near 100, 60 to 70, and 25 to 35 per cent of water-holding capacity of the Leon fs did not significantly affect the absorption of tagged N. Greater quantities of N15 were absorbed as urea than as Ca(NO3)2 or (NH4)2SO4. The use of a spreader-sticker increased the N15 uptake, regardless of the N compound used. However, the magnitude of the increased absorption associated with use as a sticker varied from 490 per cent with (NH4)2SO4 to 260 per cent with urea. It was calculated that approximately 71, 45, and 39 per cent of foliar applied N was absorbed into needles within 24 hours from urea, Ca(NO3)2, and (NH4)2SO4, respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01372827
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