This was most likely due to limited air supply (Currie 1962) since the sieved loam provides a dense growth medium upon irrigation.
The first one was the comparison of vortex mixer to magnetic stirrer (Rotamix 560MMH, Tehtnica, Zelezniki, Slovenia) for the dissolution of the viscos PEI into an aqueous medium (Topical irrigation solution, Aqua B. Braun, Melsungen, Germany).
Thus, between 1992 and 2004 India built 200 large and medium-sized irrigation projects—and the area irrigated by such schemes shrank by 3.2m hectares.The village of Veeralapalam offers a snapshot of this, and of the losers in a political economy where water is the main currency.
In particular, the medium-scale irrigation scheme utilized less than 40% of total storage, whereas the small-scale scheme utilized about 70% of the storage.
We examined two (one small- and one medium-scale) irrigation schemes shared by multiple users in the Upper East region of Ghana, including the water reservoir, water conveyance and distribution network, cropping fields, and the management entity.
The earliest medium-scale irrigation tank is the Basawakkulama reservoir built by King Pandukabhaya.
Total water consumption of wheat/maize crops under the medium and high irrigation levels was 8.5% and 18.5% greater, respectively, than that under low irrigation.
We conclude that a medium level of irrigation is sufficient to achieve crop yields and WUE equivalent to those under high level of irrigation, provided that a reduced tillage practice is applied to the wheat/maize intercropping in Oasis areas.
Many medium and small irrigation works were, however, initiated and managed by regional and village authorities, who became important props of royal authority.
It has allows the development of small and medium hydraulics and irrigation as the major schemes.
