| Studies are dedicated to an issue of different norms
impact of nitric fertilizers applied under cereals to increase
their crop yield capacity, to establish optimal irrigation
depths and norms improving water use and creating favorable
conditions for assimilation of nutrients applied into soil
under cereals to increase crop yield capacity.
Natural-economic conditions of the plot are typical
for area of Central
Fergana. Soils are weakly and medium saline. Experimental
production plot net area - 153 ha. Irrigation network - concrete
flumes, efficiency - 0.95-0.96.
Drainage is closed horizontal. Specific length - 40
m/ha. Space between drains -280 m. Drain depth - 2.7-3.0 m.
Studies show that on weakly and medium saline lands
of Central
Fergana under ground water table 1.5-2.0 m and
more cereals sowing should be carried out in September-October.
In case of inter-crop sowing over erect cotton crop
it is expedient both before sowing and simultaneously with
it to carry out inter-crop cultivation that creates porous
soil layer.
To obtain full-fledged shootings after sowing it is
recommended to carry out recharges with irrigation depth 1200-1400
m3/ha. Such water quantity completely moistens
soil and simultaneously is sufficient for weakly saline lands
leaching. If during non-growing period ground water table
is at level 1.5-2.0 m, 2-3 recharges with irrigation depth
2400-3800 m3/ha will be enough.
Given nutrients lack in lands norm of nitrogen and
phosphor application norm plays important role in obtaining
high cereals crop yield in Central Fergana under even irrigation
depth 2790 m3/ha. |
