sowing ground nut after rice crop is the surest means of enhancing nitrogen content of the soil.
grow chana on the carboard
working model on one of the topics 1.disaster management 2.agriculture 3.climate change
George Stojkovic has written: 'Market models for Swedish agriculture' -- subject(s): Agriculture, Economic aspects of Agriculture, Mathematical models
the most simple way to make a working model on food security is to surf net! lol!
working models for energy conservation are:- * * * * *
Roy Boyd has written: 'An economic model of direct and indirect effects of tax reform on agriculture' -- subject(s): Agriculture, Econometric models, Mathematical models, Taxation
James V Stout has written: 'Direct comparison of general equilibrium and partial equilibrium models in agriculture' -- subject(s): Agriculture, Econometric models, Equilibrium (Economics)
Fahmi K. Bishay has written: 'Models for spatial agricultural development planning' -- subject(s): Agriculture, Economic aspects of Agriculture, Linear programming, Mathematical models
models based on areas
By hand
wasteandrecycling
dynamo