نوع مقاله : مقاله پژوهشی
نویسندگان
1 عضو هیات علمی موسسه تحقیقات خاک و آب
2 استاد دانشگاه تربیت مدرس
3 اعضای هیات علمی موسسه تحقیقات خاک و آب.
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
A five-years research project lasting from 1998 through 2002 was conducted in order to evaluate the process of optimizing fertilizer recommendations on wheat using comprehensive computer models. The potential yields for any region of the country was taken to be equal to the maximum yield figures obtained with actual research data gathered from field work as well as data obtained with maximum potential yield estimations. Based on our calculations, the most important soil and water production factors can be listed as the rate of water application, the salinity level of irrigation water, calcium carbonate equivalent (TNV), soil texture, and finally the level of soil salinity which can determine the expected crop yield. Measuring the effect of any of these variables on crop yields enables us to calculate the potential yield for that soil. It is, therefore, necessary to evaluate the potential yield for any field before we can make any fertilizer recommendations. The rate of nutrient requirement for any crop on any field location would be calculated after determining the concentrations of plant available nutrients by using tables on different soil nutrients in addition to estimating the potential yield. The computer model input data include soil analysis data, water analysis measurements, the name of province, town and then with pressing “OK” tab, output datas include fertilizer recommendations for macronutrients, micronutrients and organic materials, data on crop variety, data of planting and the rate of seeding which should appear on the monitor and be automatically stored in the information bank memory and could be viewed on the monitor and printed as needed. This computer program was written in Visual Basic with the objective of using research data in a single model so as to be able to find quantitative answers in a simple fashion. Of major importance is the fact that the program is mechanized as to include the use of suitable date of planting, rate of seeding, and soil amendments in addition to including soil parameters, organic contents, and plant varieties for every region on irrigated production.
کلیدواژهها [English]
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