(PANS manual no. 4). London, UK ... In either case, the most important period for competition with weeds is the early part of the cropa#39;s life. ... Combinations of cultivation on the flat or on ridges, with or without mulch, f.y.m. or NPK appliedanbsp;...
|Title||:||Shifting cultivation and alternatives|
|Author||:||Daniel M. Robison, Sheila J. McKean|
|Publisher||:||Oxford Univ Pr - 1992|