01184naa a2200205 a 450000100080000000500110000800800410001910000190006024502090007926000090028852005260029765000120082365000170083565000100085265000160086265000140087865300210089265300100091377300550092313659372013-08-12       1970    bl ---       0--  u    #d1 aAGBOOLA, A. A.  aPreliminary investigation on the effect of continous cropping of maize on grain yield and on total nitrogen, available phosphorus and exchangeably potassium on three Nigerian soils.h[electronic resource]  c1970  aThe need for increased production of food and fibre for the increasing population, and the preasure of population on land for cultivation makes shifting cultivation outmoded. The system is unable to meet present day demands. Ministries of agriculture all over the country advocated rotational systems in Nigeria, while other workers on Nigeria soils. Vine (1954), Nye and Greenland (1961), Jaiyebo (1961), Aribisala (1965), and Agboola (1967) have suggested eigther planted fallow in a rotational system or mixed farming.  aNigeria  aFertilizante  aMilho  aNitrogênio  aPotássio  aEfeito na planta  aSolos  tNigerian Journal of Sciencegv. 4, p. 89-99, 1970.