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ارزیابی تاثیر تناوب زراعی بر عملکرد مزارع گندم با استفاده از تصاویر ماهواره‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، گروه مهندسی ماشین‌های کشاورزی و مکانیزاسیون، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی،ایران

2 دانشیار گروه مهندسی ماشین;های کشاورزی و مکانیزاسیون، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، اهواز ملاثانی

3 استادیار پژوهش، بخش فنی و مهندسی کشاورزی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی خوزستان، سازمان تحقیقات، آموزش

4 استادیار گروه مهندسی تولید و ژنتیک گیاهی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان، ملاثانی، ایران

چکیده

این مطالعه با هدف بررسی تاثیر تناوب ‌زراعی در مزارع گندم با استفاده از تصاویر ماهواره‌ای در منطقه شاوور استان خوزستان و در سال زراعی 1400_1399 انجام گردید. داده ‌برداری این تحقیق در قالب طرح کاملا تصادفی با سه تکرار انجام شد. تیمارها شامل چهار تناوب ‌زراعی گندم_گندم_گندم، گندم_کلزا_گندم، گندم_برنج_گندم و گندم_شبدر_گندم بودند. مقایسه میانگین شاخص‌ طیفیNDVI برگرفته از تصاویر ماهواره‌ای در قبل و بعد از تناوب نشان داد که تناوب گندم_گندم_گندم پس از گذشت دوسال زراعی منجر به کاهش 10 درصد و همچنین استفاده از برنج در تناوب گندم_برنج_گندم منجر به کاهش 50 درصد عملکرد گندم می‌گردد؛ اما استفاده از کلزا در تناوب (گندم_کلزا_گندم) و شبدر در تناوب (گندم_شبدر_گندم) به‌ترتیب منجر به افزایش 2 و 30 درصد عملکرد گندم شد. مقایسه میانگین ضریب‌ پراکنش شاخص‌ طیفیNDVI برگرفته از تصاویر ماهواره‌ای در زمان قبل و بعد از اعمال تناوب نشان داد که ضریب پراکنش در کشت مداوم گندم در اثر کاهش عملکرد، منجر به افزایش 27 درصد و در تناوب گندم_برنج_گندم در اثر کاهش عملکرد، منجر به افزایش چشمگیری شد. اما ضریب‌ پراکنش در دو تناوب گندم_کلزا_گندم و تناوب گندم_شبدر_گندم در اثر افزایش عملکرد، به‌ترتیب منجر به کاهش 57 و 32 درصدی شده است. در حالت کلی نتایج ناشی از بررسی تصاویر ماهواره‌ای نشان داد که با اعمال تناوب درست نقاط ضعیف در مزرعه عکس‌العملی بیشتری نسبت به نقاط قوی مزرعه در مقابل تغییر شرایط نشان می‌دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of the effect of crop rotation on the yield of wheat fields using satellite images

نویسندگان [English]

  • mona daghlavi 1
  • Mahmoud Ghasemi Nejad Raeini 2
  • Naim Loveimi 3
  • amin lotfi jalal-abadi 4

1 MSc Graduated, Department of Agricultural Machinery Engineering and Mechanization, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani. Iran

2 Associate Professor, Department of Agricultural Machinery and Mechanization Engineering, Khuzestan Agriculture Science and Natural Resources University (KhAU), Khuzestan, Iran

3 Assistant Professor, Agricultural Engineering Research Department, Khuzestan Agricultural and Natural Resources Research and Education center, AREEO, Ahvaz, Iran

4 Assistant Professor, Department of Plant Production Engineering and Genetics, Faculty of Agricultura, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Iran

چکیده [English]

Introduction Achieve more production, efforts should be made to increase yield per hectare. One of the things that play an important role in increasing crop production, disease control, chastity control, improving soil fertility and structure is the implementation of proper crop rotation. Crop rotation increases the efficiency of production and yield through the continuity of soil vegetation, more efficient water use, preservation of soil nutrients, increase of soil organic matter and stability of soil grains, reduction of pests and diseases, and better control of weeds. Also, data collection in the conducted research is done in a traditional way, which is usually difficult, limited and very time-consuming due to the dispersion of farms and their size.
Materials and Methods His study was conducted to investigate the effect of crop rotations on wheat yield using satellite images in three crop years 2017-2018, 2019-2028, 2019-2020 in the fields of Shavor region of Khuzestan province. In this research, all the evaluated images are related to the Sentinel-2 satellite and all these images were obtained from the US Geological Survey website. The satellite images were taken at the flowering stage of wheat, and images without clouds and fog were used on February 25, 2019 (for the year before rotation) and February 19, 2021 (for the year after rotation). Also, for pre-processing and processing and extracting information, SNAP software, Sen2Cor and ENVI plugin were used, respectively. The steps of this research were done in three steps. In the first stage, five plant spectral indices EVI, GNDVI, GARI, NDVI and RVI were evaluated to identify the best index to estimate wheat yield. The spectral index, which has a higher correlation with the yield of wheat, was chosen as the base index and was used to continue the research. In the second stage, three farms were randomly selected from each rotation to evaluate wheat yield after their application. In this section, variance analysis was performed in the form of a completely random design in three replications (one replication for each farm). The treatments include four alternations of wheat-wheat-wheat, wheat-canola-wheat, wheat-rice-wheat and wheat-clover-wheat. At this stage, the comparison of means was done by Duncan's multi-range test and in the MSTATC software environment. The third stage is the changes in wheat yield in each rotation in two times before and after applying that rotation. For this purpose, the changes of the base spectral index before and after the application of periodicity were set as criteria.
Results The results of variance analysis of five spectral indices studied in this research showed that the coefficient of explanation of each of these indices with wheat yield at the time of flowering is NDVI with 76, RVI with 73, GARI with 71, EVI with 60 and GNDVI with 57 respectively. In this research, the NDVI spectral index has the highest correlation, R2 of 76%, and the minimum error, RMSE of 0.547 earned the results showed that the average and the dispersion coefficient of the NDVI spectral index of intervals have a significant difference at the probability level of 1%. So that in terms of the average, the lowest average of the NDVI spectral index is in wheat-rice-wheat rotation with a rate of 0.2650 and the highest average is in the wheat-clover-wheat rotation with a rate of 0.5603. According to the distribution coefficient, the minimum and maximum values belonged to the rotation of wheat-canola-wheat with the rate of 0.0505 and wheat-rice-wheat with the rate of 0.1970. The results of the corresponding comparison before and after the application of each rotation showed that not observing the rotation and wheat cultivation after two crop years led to a 10% decrease and the use of rice in the crop rotation led to a 50% decrease in the NDVI spectral index. Also, the use of rapeseed and clover in crop rotations has led to an increase of 2 and 30% in NDVI spectral index compared to before rotation. The results of the dispersion coefficient of the NDVI spectral index in the time before and after the application of rotation showed that in the continuous cultivation of wheat, the dispersion coefficient due to the decrease in yield uniformity in different parts of the field led to an increase of 27% and in the rotation of wheat-rice-wheat it led to an increase of 152 became a percentage However, the distribution coefficient of wheat-canola-wheat rotation and wheat-clover-wheat rotation resulted in a decrease of 57 and 32%, respectively, due to the increase in yield uniformity in different parts of the field.
Conclusion Heat is one of the strategic products, and the evaluation of different rotations is of particular importance in increasing its yield. In this research, five plant spectral indices EVI, GNDVI, GARI, NDVI and RVI were investigated in order to identify the base index for wheat yield estimation. The results of the analysis of these indices showed that the NDVI spectral index with an explanation coefficient of 76% has the highest correlation with wheat yield. The comparison results of the NDVI spectral index correspondingly in each rotation in two states before and after the rotation showed that the continuous cultivation of wheat in an agricultural land after two crop years led to a 10% decrease in the NDVI spectral index and the use of rice in the wheat-rice rotation. - Wheat leads to a 50% decrease in the NDVI spectral index of wheat; But the use of canola and clover in the rotation of wheat-canola-wheat and wheat-clover-wheat led to an increase of 2% and 30% of NDVI spectral index, respectively. Also, the results of the comparison of the dispersion coefficient of the NDVI spectral index before and after the application of rotation showed that in the continuous cultivation of wheat, the dispersion coefficient increased by 27% due to the decrease in yield uniformity in different parts of the field, and in the wheat-rice-wheat rotation, the dispersion coefficient also as a result of the reduction of yield uniformity in different parts of the farm, it led to an increase of 152%.

کلیدواژه‌ها [English]

  • Spectral Index
  • NDVI index
  • Sentinel-2 satellite
  • Rotation
  • Yield changes
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مهندسی زراعی
دوره 45، شماره 2
شهریور 1401
صفحه 207-224
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