Effect of irrigation on evapotranspiration and yield of soybean

Abstract

A three-year study was conducted to assess the effects of irrigation on the yield and evapotranspiration of soybean grown on chernozem soil. The study was made for six soybean varieties, using several irrigation alternatives (60, 70 and 80% of field water capacity), paralleled by a non-irrigated control test. In all irrigation alternatives the yields were significantly higher than in the non-irrigated control test, in the average from 29.2 to 38.1%, noting that in two first years they were from 51.8 to 64.3% higher but in third year no differences were found between the irrigated alternatives and the non-irrigated control test. Evapotranspiration ranged from 468 to 576 mm in the irrigated alternatives, and from 390 to 5l4^mm in the control test.

U trogodišnjim ispitivanjima određivan je efekat navodnjavanja na prinos i evapotranspiraciju soje koja je gajena na zemljištu tipa černozem. Ispitivano je 6 genotipova soje pri različitoj predzalivnoj vlažnosti zemljišta u navodnjavanju (60, 70 i 80% od PVK) kao i u kontrolnoj, nezalivanoj varijanti. Na svim navodnjavanim varijantama prinos soje bio je visoko signifikantno veći u odnosu na proizvodnju bez navodnjavanja, prosečno za 29,2 do 38,1%. U prve dve sušne godine efekat je bio veći i iznosio je od 51,8 do 64,3%, dok je u trećoj godini izostao, te su prinosi bili slični na navodnjavanoj i nenavodnjavanoj varijanti. Evapotranspiracija je iznosila od 468 do 576 mm u uslovima navodnjavanja, a od 390 do 524 mm u uslovima prirode obezbeđenosti padavinama.