സസ്യങ്ങളുടെ വളർച്ച മനസിലാക്കുന്നതിനുള്ള ഉപകരണം 'ക്രെസ്ക്കോഗ്രാഫ്' കണ്ടുപിടിച്ചത് ആരാണ്?

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ജെ.സി.ബോസ് 
VILLAGE FIELD ASSISTANT 2017
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