Determine the number of working days suitable for spraying wheat fields in Qazvin province
Subject Areas :
Keywords:
Abstract :
In order to decrease the application rate and chemical in Ghazvin province, have been payed excessive cost for spraying of wheat field each year. It is took place, because of the absence of a suitable farm machinery calendar. The aim of this study is:1- Collecting required informations about limiting factors for spraying.2- Determining permissive limits of limiting factors for spraying.3- Recognizing and determining time limits for controlling of plague, diseases and weeds of wheat field.There are limiting factors for air and ground spraying. The most important of which, as mentioned in this study are rainfall, wind, temperature and relative humidity. The authorized limits of any of these factors have been determined. Since in this study, description and analysis of the data collected from the studied community were intended, first a measure was taken to gather a ten year period data (1991 -2000) from local weather station. To analysis these data, a policy was made to divide each month into six section with five day. (months with 31 days have one 6 day section each on their last columns). Then, taking the authorized limits of limiting factors into consideration, the number of suitable working days were determined for each month. Given the typical theory and the materials used in variables, ttest was used to measure the possible limits of means. After the analysis of data, it was made known, suitable work days for land spraying of sunnpest adult, Nymphs and wheat rust respectively estimated 14.75, 13.67 and 24.96 days with 95% probability and to control Broad-leaves, grass weeds and Russian aphids respectively estimated 25.73, 24.7 and 13.42 days.
_||_