Foliar applications of nitrogen to slash pine seedlings
作者： P. J. Eberhardt , W. L. Pritchett
DOI: 10.1007/BF01372827
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摘要: The absorption of N from foliar applications various sources by pine seedlings was studied under greenhouse conditions. Needles dipped into solutions 4,000 ppm Ca(NO3)2 were burned slightly at the tips two weeks. Although higher concentrations (NH2)2CO and (NH4)2SO4 could be used without plant damage, a uniform concentration 3,000 in all comparative tests sources. level tissue N, brought about soil fertilization 6 weeks previously, did not significantly influence foliarly applied N15. Soil moisture maintained near 100, 60 to 70, 25 35 per cent water-holding capacity Leon fs affect tagged N. Greater quantities N15 absorbed as urea than or (NH4)2SO4. use spreader-sticker increased uptake, regardless compound used. However, magnitude associated with sticker varied 490 260 urea. It calculated that approximately 71, 45, 39 needles within 24 hours urea, Ca(NO3)2, (NH4)2SO4, respectively.
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