Irrigation tests on sunflower crops were carried out at the Experiment Station at Paine during, the 1950-51 and 1951 seasons.
A rectangular notch was employed to determine the water used in the trials. To distribute the water in the plots, a special arragement of two leveled hatches was successfully used.
Identical or almost identical volumes of water were consumed in each watering.
Irrigation were regularly distributed between thedate when the first irrigation was needed and the date of seed maturity. Irrigation was carried out 3, 5, 7 and 10 timets during the season.
It is assumed that rainfall did not affect the trials because the amounts involved were small.
Results of tests during these two years showed the sowingmaturity period was not shortened by drought.
As expected, water amounts affected the plant size.
The maximuin seed yields of 2.069 tones per hectarea was optained with the use of more than 1.000.000 liters per hectarea in the trials.
The highest seed yields was obtained with the 10-irrigation treatment, but yield does not seem to increase at the same rate beyond the 7-irrigation treatment.
Hectoliter weight showed that not even the maximum water amounts gave an extraordinary seed development. In other words, planlts with abundant irrigations water did not produce seeds with low oil characteristies.
Seed yield was strongly affected by the increasing water quantities. In both years seed yield increased by nearly 100% if we compare the lowest and the highest treatments. |
ChileanJAR
