Influence of planting date and nitrogen on yield and components of medicinal flax
The effect of sowing date and different nitrogen (N) levels on the quality of medicinal flax was investigated in an experiment performed in split plot in form of Randomized Complete Block Design with 4 replications in 2005–2006 and 2006–2007 in the Yasooj Agriculture Research Station. The 5 sowing dates included 4, 6,8,10, and 12°C on the basis of temperature in 5-cm soil depth in the main plots and 4-fertilizer levels in sub-plots with no fertilizer, 50, 100 and 150kg/ha pure N (urea as source) of which 50% was used at the time of sowing and 50% in the way of top-dressing. The results of complex 2-year analysis of data indicate that with delayed sowing the plant height, the number of branches, the number of fruits, the grain yield, the 1000-seed weight, the leaf area index, the dry matter, the crop growth rate and the oil percentage were reduced significantly. The use of 100kg/ha pure N significantly increased plant height, number of branches, number of fruits, grain yield, leaf area index, dry matter, crop growth . First sowing date with 1801.12kg/ha resulted inhighest yields and fifth sowing date with 760.48 in the lowest one.
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