Floral analsis, as a possible tool for prognosis of nutritional disordrs in peach trees(Red haven) with GF677 and Missouri rootstocks.‎

Iron chlorosis is an important problem in peach trees in calcareous soils of Iran and effets over 60% of Iranian soils. The purpose of this investigation was to prognosis of nutrient status, vegetative vigoure and fruit quality of Red haven peach trees grafted on GF677 and Missouri rootstocks in a lime soil such as kamalabad soil in karaj. Split pbt design on the basis of completely randomized block design with three replication during 2002-2007 was used. Rootstocks in Two levels (Missouri and GF677) were used as the main plot and 4 levels of nitrogen in soil (N0=as contorl, N1=200g nitrogen/Tree, N2= 400g nitrogen/ tree, N3= 600gnitrogen/tree ) was as subplot Flower indices, leave parameters, vegetative vigours and also fruit qualities were recorded for each grafting combination from2006and 2007.The data were analysed each year and combined analysis at the and of experiment. The results ( of first year experiment(2006) in field released that the most important factor for predicting leaf chlorophyll concentration of Red haven cultivar on GF677 rootstock was flower Fe content and for those grafted on Missouri seedling rootstock was flower- Zn content. The data presented also suggest that some indices of flowers ( mineral concentration in flowers and dry and wet weight of flowers at fullbloom time) could be considered as prognosis tool for an early estimation of vegetative vigour of peach trees, Also the result of first year experiment in field released that with increasing N rate in soil flower-P and-zn level, flower dry weight, leaf chlorophyll (SPAD- values) and vegetative vigour ( height, canopy extension, trunk cross sectional area, mean shoot length) of trees grafted on Gf677 increased while in trees grafted on Missouri with increasing N rate in soil the mean shoot length, height, trunk cross sectional area, canopy extension and flower- Fe content increased. In the second year of experiment (2007) in field the results as followed: wet weight of flower , flower -Fe and – Zn content of Redhaven cultivar GF677 rootstock could be good tool for predicting leaf chlorophyll concentration and for those grafted on Misouri rootstock was only dry weight of flowers. The analysis of flower ( Fe and Zn content in flowers ) dry and wet weight of flowers, which had been completed in both of scion/ rootstocks ( Red haven × Missouri, Redhaven ×GF677) before leaves and fruit set haven emerged, has been proposed as a tool to predict mineral content in leaves, vegetative vigour and also fruit quality ( totals ubstance solution, pH of fruit and total acidity of trees later in the year. Also the results of the second year experiment in field (2007) released that with increasing N rate in soil flower- Fe content, Leave Fe- and – Zn contentleave surface and canopy extention of peach trees grafted on GF677 in creased, while in trees grafted on Missouri with in creasing N rate in soil flower- Fe content and leaf chlorophyll ( SPAD- Value) in creased. The combined analysis of variance indicated that there was a significant differences between years for all of studied parmenters (except of chlorophyll a, b, a+b and dry weight of flowers) between rootstocks ( except leaf surface, flower Zn content, Trunkcross- sectional area) and between different level of N in soil (except of leaf- Fe content, wet and dry weight of flow.er , leaf surface, hight and trunkcross sectional area) Interaction between rootstock and different level of N in soil was significant in all of studied paramentrs ( except of wet and dry weight of flower, leaf surface, chlorophyll (SPAD- Value), mean shoot length and canopy extension) .Also it is concluded that 400g N/tree to 5-year old onwards peachtrees on Missouri rootstocks was optimum for leaf chlorophyll concentration and 600g N/tree for Fe-content in flower, while in trees grafted on GF677 200g N/Tree for leaf chlorophyll and for Fe- content in flower was optimum.