- 期刊
- OpenAccess
Investigating the Effect of Phosphorus, Potassium and Weed Management on Forage and Seed Yield of Alfalfa Ecotypes (＂Medicago Sativa＂ L.)
並列摘要
In order to investigate fertilizing and weed management effects on forage and seed yield of alfalfa ecotypes, a field trial was conducted during 2008-2009 growing season at Khorasan Agricultural and Natural Resource Research Center, Mashhad-Iran. Alfalfa ecotypes including (Ghareghozlo, Hoakmabad, Malekkandi, Kozre, Faminin, Galebani, Rahnani, Shorkat, Chaleshtar, Ghareaghaj, Gharoghlogh, Ordobad, Sedighan, Silvana, Sahandava, Ghahavand, Mohajerankaraj and Mashhad) were allocated to main plots; sub plots consisted of two levels of none fertilizing and fertilization treatments using simultaneous application of potassium sulphate and phosphate triple at rates of 150 and 350 K/ha, respectively and sub-sub plots were allocated to weeding and none weeding treatments based on a complete randomized block design in a splitsplit- plot scheme with three replicates. Results showed that the effect of ecotype on forage yield was not significant. Gharoghlogh and Silvana produced the highest (18270 kg/ha) and the lowest (14630 kg/ha) green forage yield, respectively at both cuttings (first and second cuts). The interaction of fertilization and weeding on forage yield was significant (p＜0.01). On the other hand, with application of fertilizer, forage yield 11.74% was increased and it was enhanced 26.93% by manual weeding. Furthermore, results revealed that ecotype fertilizer interaction was significant (p＜0.05) for weed dry weight. Ecotype weeding interaction was significant (p＜0.05) for number of seed per pod and seed weight (p＜0.01). In addition, fertilizer weeding interaction was significant (p＜0.05) for number of seed per plant. Among the treatments, highest number of seed per plant was produced by fertilizer and weeding treatment (2734) and the lowest one was obtained by non-fertilizer and non-weeding treatment (559.5).