The study of the effect of nitrogen rate and duration weed interference periods on grain yield and distribution of dry matter of corn (Zea mays L.)

摘要

Performanceelements,anexperienceisimplementedinsummer2010,atthestation ofAhvazagricultures researchcenteras broken plotinadesignframeworkofaccidental blockswith3repetition.Themainfactorof differentamountofnitrogeninclude3level N60,N120,N180kg/litpurenitrogenofurearesource&secondary factorof weedsinterventioninclude3levels(i)continuousweeduntil theendof corn growthperiod (w1), (ii)one time weed in 6leave level(w2), (iii) complete interventionof weedwithcornuntil theendof corngrowthperiod. The acquired resultsindicatedthatweed interventionon yield &yieldcomponenthas ameaningfuleffect&by increasingtheperiod of weedintervention,thegrain yieldis reduced. Increasingweedcompetition make a meaningful effectongrainweight,performance, biologicalperformance&harvestingindex.Butincreasing amountofnitrogenfromN120kg/littoN180kg/lithadnotameaningful effectongrainperformance&insome cases duetohighpressure,thecompetitionfromweedmakereductionofgrainperformance,(onceweed treatment&allseasonintervention).Inlow&highlevelofnitrogen,biologicalperformance&cornperformance is respectivelyaffected byweed. According to the resultsofthis experience,itcanbe resulted thatbyreducing competition timeof weed, increasing Ncan make grainperformance enhancement.In contrast toweed competition time, increasingnutritive ingredientis anaffected weedgrowthmore thanagriculture plant&makes weed competition power enhancement