جستجوی مقالات مرتبط با کلیدواژه "ضخامت پوست" در نشریات گروه "زراعت"

Pre-harvest fruit splitting each year causing a significant reduction in yield and the prevalence of fungal rot in citrus fruits. In this research, effect of rootstock and also, physical traits of fruits on the severity of pre-harvest fruit splitting were investigated. For this purpose, a research was performed in 2016-17 based on RCBD statistical design with three blocks of three mandarin cultivars (Page, Kara and Cadoux) grafted on four rootstocks (Sour orange, Citrange, Citrumelo and Cleopatra mandarin) under dry farming condition in Tonekabon city (private orchard). Obtained results showed that, both two investigated factors had significant effects on this disorder. According to results, sour orange and citrumelo caused the highest and lowest fruit splitting respectively and two other rootstocks with no significant difference were at an intermediate level in this regard. The significant role of growth pattern, thickness and cell density of peel at the stylar end of fruits on pre-harvest fruit splitting, caused that Page and Cadoux have the highest and lowest percent of fruit splitting respectively. Results also showed that cell density on the peel of the split fruits was lower than healthy ones.

To investigate the effect of K fertilizer on yield and yield components of three watermelon cultivars, a two-year study (2007-2008) was conducted in Ardestan Agricultural Research Center (Isfahan province) by using of split plot randomized based on complete block design in three replications. Three watermelon cultivars (‘Sugar baby’, ‘Charleston Grey’ and ‘Mahbubi’), were assigned as main plots and four K fertilizer levels (zero, 50, 100, and 150 kg K.ha-1) were assigned as subplots. Two and three times higher than consumption of K fertilizer (100 and 150 kg K.ha-1) in compared to normal conditions (without salinity), led to a 24.8 and 18.5 percent increase in yield of ‘Charlston Gray’ and ‘Sugar Baby’, respectively. The highest fruit yield (39112 kg.ha-1), was obtained using 150 kg K.ha-1 in ‘Charleston Gray’ cultivar. Potassium applications at all levels, increased fruit number in ‘Sugar Baby’ and fruit weight in ‘Charleston Gray’, were considered as the main reason for increasing yield. By increasing of K application, the ratio of Na/K in the leaves from 0.61 to 0.33 and in the stems from 0.81 to 0.4 was decreased. The results indicated that in saline conditions, higher levels of K fertilizers can reduce the deleterious effects of salinity and thus may improve watermelon yield.