Field trial for characteristics of soil water and salt distribution in drip fertigation of kalium-using fertilizers

The chemical ameliorant using in salt field is a kind of efficient method, which can meliorate the physical chemistry characteristics of soil. But a problem is always concerned, that is how to combine chemical ameliorant and the under-mulch drip irrigation and the soil fertility. Through analyzing characteristics of soil water and salt distribution in drip fertigation of kalium-using fertilizers, the characteristics of soil water and ion distribution were studied under three kinds of kalium-using concentrations as 400, 800 and 1 000 mg/L and five kinds of kalium-using modes (continuous drip irrigation, drip irrigation of water (W)—drip fertigation of KNO₃ (K), K-W, K-W-K, and W-K-W) as concatenation, in 0-30 cm cultivation layer. Results indicated that the soil ion forms were changed through drip fertigation of kalium-using fertilizers, Ca²⁺ and Mg²⁺ concentrations relatively increased, Na⁺ concentration reduced, anion SO₃ ^2-concentration increased and Cl- concentration falled, the total salt content, sodium absorption ratio (SAR) and Cl-/SO₃ ^2- reduced by high kalium-using concentration in cultivation layer, SAR and Cl-/SO₃ ^2- in W-K kalium-using mode were least in five kinds of kalium-using modes, which showed drip fertigation of niter-using had visible meliorated effect in cultivation layer, and the effect of pulling salts with 1 000 mg/L kalium-using fertilizer and W-K mode were best in three kinds of kalium-using concentrations and five kinds of kalium-using modes.