The effects of K, B and Cu rates on yield and Quality of alfalfa
2007
Esmaieli, Mohammad | Damavandi, Abbasali | Taghadosi, Mohammad Vali | Sohrabi, Esmaiel | Golchin, Ahmad
In order to study the effect of different amounts of K, B and Cu qualitive and Quantity characters of alfalfa (Medicago sativa var Hamadani), this experiment carried using a factorial design in a RCBD layout with 18 treatments and 3 replications, from 1998 to 2001, in kheirabad research station in Zanjan, Iran. Treatments were different levels of K(0,100, 200 Kg/ha K2o as K2So4), B (0, 1.5, 3 Kg/ha from Boric Acid) and Cu (0, 6 Kg/ha from Cuso4). Potassium and boron were applied after first harvesting annually, but copper only used in the first year. Experimental data were collected in during 3 years from 1999 to 2004, so that yield of treatments were measured in 3 harvest and plant nutrients content (including N, P, K, Cu and B) and soil characters (including O.C, K, P, Cu and B) was evaluated in second harvest in each year and last year, respectively. The result of variance analysis indicated that K alone did not affect the yield of plants, but application of B and Cu lonely and K in combination with Cu increased it, significantly. The Intreaction of K, Cu and Boron on Dry matters of alfalfa were significant, so that maximum value 15 t/ha, obtained from K1B0Cu1 and K2B0Cu1 totally cu alone or mixed with K was the best treatment for increase of yield. Treatments increased level of K, Cu and B of plants significantly, but K level in soil greatly decreased after 3 years, especially in control. Therefore, to achieve optimum yield of alfalfa and avoid from nutrients depletion (especially K), it is recommended to apply 24 Kg/ha Cuso4 before planting and 100 Kg K2o after first harvesting in every year by the farmers.
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