Abstract
In order to study of changing of macro elements in water stress condition an experimental design was carried out to study effect of different levels irrigation (0, 25, 50, 75) percentage of Field Capacity (FC) on changing macro elements (N, P, K) in 5 rapeseed genotypes (PF7045-01, Symbol, Mohican, Hyola-42, Syn-1). The experimental design split plot in Randomized Complete Block with 4 replication at 2004. Investigation was carried out in Varamin university field research. The information gain about the yield grain, number of pods per plant, number of seeds per pods, weight 1000 grain, oil percentage and yield oil. At the end of investigation, for to valued quantity each element in each treatment, sample of leaf transmits in laboratory and valued quantity elements N, P, K. As result that in, quantity element in different levels irrigation and interaction between the both of them were significant. Interaction between genotypes and levels irrigation were significant at the 0.01%. Basically table of ANOVA in all of the treatment, drought stress were cause decrease quantity elements at different genotypes exception element N that with increase intensity drought stress, percentage that was increase in leaves. The yield impressed genotypes and drought stress levels. With increase intensity drought stress of 0.75-0%, mean Field Capacity decreased of 3340-1788 kg h -1 . Between genotypes, Hyola-42 and Symbol with mean 3377.5 and 1947 kg h -1 were highest and the lowest yield respectively. Oil seed percentage didn't impress on genotypes but with increase intensity drought stress, decreased quantity and mean were of 43.1%, at treatment irrigation 75% FC, to 40.2% in treatment irrigation 0% and 25% FC. With increase intensity drought stress, the quantity saturation fats and glucosinolates seed increased and quality oil decreased.
Highlights
At tendency increase world populations, asking increasing for agricultural produces, wheat, Corn, Maize and Legumes main food humans but role of the seeds oil cant deny
Time of start actions water stress in growth step 4.5 basis on inserted code period growth rapeseed that this step 50% was carried out all sprout on cluster flowered or are flowering at the 4 levels (0, 25, 50, 75% Field Capacity (FC)) At the first step, leaves, by the normal water and with chloric acid 1% normal at the time lower than 30 sec and with normal water and deionizer water washed
At tendency water stress with treatment irrigation basis on 0 and 25% FC that caused shortened period of growth vegetative, probably the tolerated genotype in this investigation by use of capability escaping of drought and high level P and especially K at this genotypes could be that result some of the researchers comparable[5] prevented of the decreasing intensity detail yield
Summary
At tendency increase world populations, asking increasing for agricultural produces, wheat, Corn, Maize and Legumes main food humans but role of the seeds oil cant deny. Rapeseed is a kind of plant that nutrient more efficiently absorb of soil[2] All of these conditions would be in full of irrigation. At the drought stress, cause of closed stigmata and decreasing absorb Co2, produce dry martial and use efficiency of element intensity decreased is the most important element in produce crop plant this element cause stimulus growth and is in structure amino acid, alkali and protein and porins. But an other researchers, state inverse this posture and knowing shortage intensity P cause decreasing quantity oil grain of 33 to 23% and cause more decreasing PO4−2, HPO4−, H2PO4−, glucosinolates percentage slightly increased and quality oil decreasing. At tendency to role catalyze K, because active 60 kind plants of enzymes and use efficiency better enzymes caused increasing photosynthetic and are producing dry matter and are increasing yield. Effect on in dry condition, its very important because of K with rolled open and close stomata and change photosynthetic and formed organic acids Specially Malic acid that in process dry tolerance is efficient[6]
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