00309nam a22001097a 4500020001500000082001400015100003000029245006300059250000600122260006300128300000800191  a812240667X  a631.5 PAL  aPalaniappan & Sivaraman K  aCropping Systems in the Tropics: Principles and management  a2  aNew Delhi, New Age International (P) Ltd, Publishersc1994  a211