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040			_cCICY
090			_aB-15610
245	1	0	_aSoil nitrogen changes in farming systems in the humid tropics
490	0		_vBiological Nitrogen Fixation in Farming Systems of the tropics, p.27-42, 1977
520	3		_aThe available information shows: (1)that rather large quantities of nitrogen are contained in fallow vegetation and underlying soil ant that upon clearing the fallow large amounts of nitrogen era mineralized; (2)That leaching processes are not such thata the nitrate is rapidly moved out of the soil and sub-soil; (3)that there is no good evidence for or against the proposition that the ordinary arable crops are shallow feeders and the fallow vegetation has deep root systems; since soil dry out in the dry season there are some plant covers which indicate more nitrate in sub-soils under arable than fallow conditions; and (4)no data were found which would negate the hypothesis that sub-soil nitrogen is an important component in the nitrogen cycle in the tropics
650	1	4	_aSUELOS - NITRÓGENO
650	1	4	_aPLANTAS - NITRÓGENO
700	1	2	_aBartjolomew, W.V.
856	4	0	_uhttps://drive.google.com/file/d/1qQ4fU22rW05PZhZ0WmaFqz8UqFgcOyjD/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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