The effect of soil ph and nutrient content on crop yield and weed infestation in the crop rotation / | Sėjomainos augalų derliaus ir piktžolėtumo priklausomumas nuo dirvožemio rūgštumo ir gausumo jame maisto medžiagų.
2006
Čiuberkis, Steponas, | Končius, Donatas,
The aim of the present study was to investigate the effect of different soil pH levels, nutrient content and its interaction on the crop productivity in a rotation and on crop weed infestation. During the period 1976-2005 after initial and periodical liming such average soil pH levels of the sixth rotation were formed (2000-2005): 4.1; 5.1; 5.4; 5.9; 6.2 and 6.6. The amount of mobile phosphorus / potassium in the sixth crop rotation was on average 70 / 130 mg kg-1 soil in unfertilized plots. After systematic crop fertilization with single, double, triple rates of mineral fertilizers the content of phosphorus / potassium increased to 120 / 210, 190 / 280 and 280 / 310 mg kg-1 soil respectively. A high grain yield of barley was produced in the plots with pH 6.6 and phosphorus / potassium content 280 / 310 mg kg-1 soil. Winter wheat grain yield increased with declining soil acidity to pH 5.4 and increasing P2O5 / K2O to 190 / 280 mg kg-1 soil. A high yield of spring rape seed was obtained in the plots with pH 6.6 and 280 / 310 mg kg-1 P2O5 / K2O in the soil. The highest content of metabolisable energy was accumulated in the soil plots with pH 5.9, and a high productivity was achieved in the plots with the content of phosphorus / potassium 280 / 310 mg kg-1 soil. With a reduction in soil pH from 4.1 to 6.6 weed infestation consistently declined in all crops (R = -0.71). Different nutrient content in the soil did not have any significant effect on cereal and spring rape weed infestation.
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