فهرست مطالب behzad sharib

To determine the critical period of weed control in transplanted tomato in Kermanshah, in order to reduce the weed control costs.

a field experiment was conducted in a randomized complete block design with three replications. Treatments were divided in to two series. The first one consisted of six weed interference until 0, 15, 30, 45, 60 and 75 days after transplanting and then weeds were removed until the end of the growth period, and the second one consisted of six weed control until 0, 15, 30, 45, 60 and 75 days after transplanting and then permit to weeds to complete to crop until the end of growth season.

The results showed that full weed interference reduced total dry matter, maximum leaf area index and fresh fruit yield of tomato by 67.2, 36.5 and 83.5 percentages, respectively. The critical period for weed control was determined using logistic and gompertz functions. Critical period of weed control based on 5 and 10 percent acceptable yield loss was determined from 14 to 89 and from 19 to 78 days after transplanting, respectively, that was equal to from 103 to 1189 and from 144 to 1003 growth degree days after transplanting, respectively.

Generally due to the low planting density and the non-complete canopy closure, it is necessary to weed control be started from two to three weeks after tomato transplanting and continued for five to six weeks.

The goals of study were to evaluate of Alfalfa traits by using penergetic P and K under free and infested by Dodder (Cuscuta campestris).

The greenhouse experiment was conducted at the Faculty of Agriculture, University of Tabriz in 2017. The experimental design was a completely randomized design with 8 treatments and two replications. Treatments were penergetic P+dodder infested , penergetic K+dodder infested, penergetic water+dodder infested, control+dodder infested, penergetic P+dodder free, penergetic K+dodder free, penergetic water+dodder free and control+dodder free.

Different treatments of penergetic had significant effect on plant height, number of sub stem per plant, diameter of main stem, fresh weight, number of leaves per plant, chlorophyll index and alfalfa biomass. The highest plant height with 49.18cm was achieved by penergetic water + dodder free and the highest chlorophyll index under penergetic P + dodder infested. The highest biomass yield was obtained from penergetic P+ dodder free treatment and the lowest biomass yield was observed in control+dodder infested treatment.

It can be concluded that using of different treatments of penergetic in the recommended doses increase the alfalfa resistance to dodder.