In order to utilize sandy barren lands in Korea, a culture measure, i.e., Nutri-Irrigation culture was studied.
By labor-saving irrigation method of scattered watering or nozzle sprinkling, and a dilute nutrient solution, containing N 100-200, P 100-115, K 89-177, Ca 37-44, Mg 12-44㎎ per liter, the culture measure was experimented on Chinese cabbage, lettuce, spinach, sweet potato and radish on sandy soil.
Rapid growth was resulted in larger fresh weight per plant, e. g. 342-409 gr. in Chinese cabbage etc. at 35 days after seeding.
For constituents and radio of N. P. K. in watering solution of nutrients, the lower potassium concentration gave arise good growth of lettuce etc. as well as higher potassium.
Also, larger urea quantity promoted growth of radish very much meaning that the sand with Nutri-Irrigation culture could supply potassium efficiently and utilize urea of larger quantity through facilitate ammonification of urea.
The higher productivity of Nutri-Irrigation culture in sand resulting in 1260-2058 gr of radish yield in sand comparing with 908 gr perm in soil culture would be (dependant on 1), the function of facilitated absorbtion, (e.g. absorbed nitrogen was 52.6-130.9 gr per 1㎡ in sand and 31.5g in soil (and 2) a newly found character and e the culture, i.e. gathering character of sand to root system, as well as oxygen supplying function and permeability etc. of sand.
As the Nutri-Irrigation culture needed no retaining power of nutrients in soil and was labor saving(economical), the widely distributed sandy barren lands and low productive lands could be utilised advantageously by the present the culture practice
Continued work is necessary for the applied experiments on the sandy barren lands on river side of Han-Kang ect. and in south west coast, developing the cultural measure by further study.
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