مقالات رزومه دکتر مهدی غفاری

This study was carried out at the research farm of Agriculture Faculty, Bu- Ali Sina university, in 2009, to evaluate the effect of winter cereals as cover crops on weed control, improving soil fertility, yield and yield components of potato. The experiment was a randomized complete block design with three replications. The trial including seven treatments consisted of no cover crop, rye, barley and triticale, each with common and triple plant density. The results showed that rye and barley with triple plant density produced 1503.5 and 1392.2 g/m2, respectively. Rye, barley, triticale with triple and rye with common plant density reduced winter weeds biomass 97, 96, 93 and 89 percent respectively, compared to control. Cover crop treatments showed different abilities to weed control in potato growth period (15, 45 and 75 Day After Germination) compared to the control treatment. The treatments, of rye and barley with triple and rye with common plant density had the most inhibition effects on summer weeds. Soil physical properties were affected significantly by cover crops, so rye, barley and triticale with triple and rye with common plant density, increased organic carbon 26, 25, 21 and 25 percent, respectively compared with the control treatment. Rye and barley with triple and rye with common plant density, decreased soil specific weight 6.6, 7.5 and 7.4 percent, respectively compared with the control treatment. There was a significant correlation between weeds plant population and the dry matter of potato, organic carbon percentage, soil specific weight and number of large potato tubers with potato tuber yield. Rye with common and triple plant density and barley with triple plant density compared to control increased tuber yield of potato 50, 33 and 35 percent, respectively. These treatments increased the number of large potato tuber 42, 33 and 27 percent, respectively compared with control.

This study was carried out at the research farm of Agriculture faculty, Bu- Ali Sina university in 2009, to evaluate the effect of cover crop residue on improving soil fertility, yield and yield components of potato. The experiment was a randomized complete block design with three replications. The trial included of seven treatments consists of no cover crop, rye, barley and triticale each one with common plant density and triple plant. The results showed that rye and barley with triple plant density produced 15035 and 13922 Kg.ha-1, respectively and were prior to the than other treatments. Soil physical properties were affected significantly by cover crops, so rye, barley and triticale with triple and rye with common plant density, increased organic carbon 26, 25, 21 and 25 percent, respectively in compare with control treatment. Rye and barley with triple and rye with common plant density, showed the lowest soil specific weight than control. There was a significant correlations between organic carbon percentage, soil specific weight and number of large potato tubers with potato tuber yield. Rye and barley with triple plant density and rye with common plant density in compare to control increased tuber yield of potato 14.6, 15.3 and 21.8 ton/ha, respectively. These treatments increased the number of large potato tuber 33, 27and 42 percent, respectively in compare with control.

Now a day winter cover crops planting has been attended to reduce herbicide application. An experiment was carried out at the Research Farm of Agriculture Faculty, Bu- Ali Sina, University, in 2009. The experiment was a randomized complete block design with three replications. The trial included of five treatments consists of no cover crop, rye, winter oilseed rape, barley and triticale. The results showed that winter cereals were produced more biomass than winter oilseed rape. living mulch of rye, barley, oilseed rape and triticale reduced winter weeds biomass 89, 86, 82 and 70 percent respectively, in compare to control. Cover crop treatments showed significant different weeds control of potato at 3 time (15, 45 and 75 DAPG) compare to control treatment. Residues mixed to soil of oilseed rape and rye had the most inhibition affects on summer weeds. These treatments, average weeds biomass decreased 61 and 57 percent respectively, in compare to control. Oilseed rape and rye in compare to control reduced weeds density in potato 36 and 35 percent, respectively. Significant negation correlations of weeds plant population, weeds dry matter with average tuber weight and potato yield. The treatments, oilseed rape and rye in compare to control increased tuber yield of potato 54 and 50 percent, respectively. These treatments, the average tuber weight increased 74 and 38 percent in compare with control, respectively.