Models of the Productivity of Agricultural Crops

The maximal yield of eatable plant parts is not the same as the maximal total production. A. Connection between gross primary production and net primary production. B. Effects that the duration of the vegetation period has on the yield of grains and the total dry substance at the soil, i.e. straw and grains with rice (according to J.L. MONTEITH, 1965, E. BLACK, 1963, R. BEST, 1962).

Biomass, net and gross production of the ecosystem wood and of a culture of microorganisms.