Effect of crop residues on interception and activity of prosulfocarb, pyroxasulfone, and trifluralin.

摘要: Crop residue retention on the soil surface in no-tillage system can intercept pre-emergent herbicides and reduce their efficacy. Three experiments were conducted to investigate effect of crop amount (0, 1, 2 4 t ha–1), moisture (wet versus dry), type (wheat, barley, canola, chickpea lupin) age (fresh or aged for one year) interception subsequent leaching prosulfocarb, pyroxasulfone, trifluralin from into soil. Bioassays, using cucumber annual ryegrass as indicator plants, used assess herbicide activity/availability residue. Herbicide increased considerably quantity ha–1. After simulated rainfall, which washed soil, complete control occurred with 0 ha–1 residue, prosulfocarb 1 pyroxasulfone all rates. Therefore, rain irrigation, was least affected by high loads. Less chemical leached after when applied wet compared dry but initial condition had no If practically possible, farmers should minimise spraying onto Barley wheat residues intercepted more than an equivalent mass lupin largely due ground cover cereal residues. The relatively small variable. Overall, reached sprayed one-year old new reduced A strong positive linear relationship existed between percentage growth bioassay species (r2 = 0.75). This means that there little difference ability adsorb retain types ages, such simply use interception.