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vegetable science production of vegetable crop seed plot technique potato cultural practices vegetable cultivation winged bean (psophocarpus tetragonolobus) protected cultivation instruments green house agrometeorology mango producion culture practices for mango cultivation mango cultivation pomology horticulture environment plant biotechnology china history china- british war opium war ii opium war i china opium war opium war pgpr rhizosphere technology bio remediation biostimulation biotechnology in vegetable crop transgenics river bed cultivation production of cucurbits cucurbits special practices involve in potato cultivation potato cultivation gmo