Article

Effect of foliar application with calcium nitrate on quality of sanguine orange

Authors:
To read the full-text of this research, you can request a copy directly from the authors.

Abstract

In the most of southern and northern of the country cultivation citrus yield is relatively low per unit area. In order to increase production two different methods can be used: the first one is to expand the area under cultivation and the second one is increasing the yield unit per area. It is very difficult to expand the area under cultivation in the country according to the problems related to the water limitation and beneficial facilities. Therefore the fundamental solution to increase the production is to increase the yield unit per area. Therefore, an experiment in a randomized complete block design with 5 treatments was conducted to gain some qualitative and quantitative characters of fruit. Treatments were sprayed on Leaves with calcium nitrate concentrations (2.5 and 5) in 1000 with a single spraying and double spraying treatment. The results showed that treatment of the tree with calcium treatments on tree increases Ph, fruit density, and the total acidity. Calcium treatment because of the increased thickness of the peel was more effective than other treatments in maintaining fruit quality. The findings shown that calcium is effective on maintaining the fruit quality. It absorbed with double valance and also calcium is the most static matter above the other essential matters and its definitely is usually observed in fruits. Therefore calcium nitrate application for its fast absorbent can effects on this matter.

No full-text available

Request Full-text Paper PDF

To read the full-text of this research,
you can request a copy directly from the authors.

Article
Variable rate application of fertilizers can mitigate the pollution caused by their uncontrolled usage. One way to develop variable rate technologies is to convert conventional agricultural implements into variable rate implements using an electronic control system. To do so, a fertilizer application rate control system was developed and mounted on a four-row fertilizer applicator. This system included sensors for travel speed, fertilizer metering gate position, fertilizer metering gate actuators, controller and GPS receiver. This system adjusted the fertilizing rate by changing the metering device gate position. In order to increase the precision of the map-based variable rate fertilizer applicator, its response time was measured in the Farm Machinery Workshop of Imam Higher Education Center. The response is divided into two parts: the mechanical latency time and fertilizer particles fall time from the metering device into furrow. The mechanical latency was measured for application rate changes of 100, 150, 250, 400 and 500 kg/ha (at total working range of metering device) with three replications. The changes in the fertilizing rate were first performed from low to high and then from high to low. The fall delay of fertilizer particles from fertilizer metering device to furrow was measured by an impact sensor at three speed levels (5.3, 5.75 and 8 km/h) appropriate speed range for the applicator operation, in five replications. The advance distance for changing the application rate before reaching the new-rate area on the field was a function of fall delay and mechanical latency of the implement. The mechanical latency was also a function of the difference between the primary and target rates. The maximum and minimum advance distances were 10.81 and 0.46 m, respectively, for 8 and 3 km/h travel speeds.
Article
In order to examine the effect of pre-sowing plants and different nitrogen levels on quality and yield of maize, a research was conducted in the field of Agricultural Jihad Management in Bawi (Molasani). The experiment was conducted as split plots in the form of randomized complete block design with four replications. Main plots included different levels of urea fertilizer (0, 100, 150 kg/ha) and sub plots included the pre-sowing plants of canola and wheat. The ANOVA results showed that the studied traits including the yield and yield components (number of grains per row, number of rows per ear, number of grains per ear, 1000-grain weight, and harvest index). Grain yield was particularly affected by different levels of urea fertilizer, type of pre-sowing plant (canola and wheat) and their interactive effect. Mean comparison of different levels of urea fertilizer showed that as the consumption of urea fertilizer increased in maize the studied traits increased, too. Moreover, planting maize after canola compared to wheat led to the increase of all traits. The results of interactive effect showed that during the maize planting after canola along with the consumption of more urea fertilizer the traits were positively influenced. Consequently, it can be stated that the consumption of 150 kg/ha urea fertilizer and canola pre-sowing led to the improvement and increase of quantitative and qualitative traits in maize.
Article
Cultural practices, such as agronomic nitrogen and potassium fertilization, affect vegetation growth cover which causes microclimate variations and generating changes in the development of fungal diseases.The experimentation was conducted in open field to study the effect of four fertilization modalities, combining various doses of nitrogen and potassium fertilizers, applied during the sensitive stages of durum wheat culture (Vitron variety) on septoria leaf blotch disease.The ratings of disease severity after artificial inoculation with Septoria tritici on 3 leafs stage, have shown that applications of nitrogen fertilizers increase the severity of the disease, especially in terms of inputs without potassium. Foliar supply of potash fertilizer in stem extension stage minimizes yield losses of 14%, avoiding the spread of the disease on the flag leaf.