تعیین تبخیر-تعرق و ضریب گیاهی گلرنگ در شرایط کم‌آبیاری با آب شور در گلخانه
محورهای موضوعی : مدیریت بهینه منابع آب و خاکمهدی مکاری 1 , جواد علایی 2 , امیرحسین قادری 3
1 - استاديار، گروه مهندسي آب، مرکز آموزش عالي کاشمر، کاشمر، ايران.
2 - دانشجوي دکتري، گروه مهندسي آب، دانشکده کشاورزي، دانشگاه علوم کشاورزي و منابع طبيعي گرگان، گرگان، ايران.
3 - دانش‌آموخته کارشناسي ارشد، گروه مهندسي آب، دانشکده کشاورزي، دانشگاه علوم کشاورزي و منابع طبيعي گرگان، گرگان، ايران.
کلید واژه: شوری, کمیابی آب, , لایسی‌متر کوچک, نیاز آبی ,
چکیده مقاله :
زمينه و هدف: آگاهي از نياز آبي که تابعي از نوع گياه و پارامترهاي هواشناسي مي‌باشد به‌منظور برنامه‌ريزي آبياري، امري ضروري است. لايسي‌مترهاي وزني و زهکش‌دار کوچک به دليل اندازه‌گيري مستقيم آب مصرفي، دقيق‌ترين روش براي محاسبه تبخير-تعرق بوده و خطاهاي ناشي از واسنجي نمودن وسايل اندازه‌گيري رطوبت خاک نظير تانسيومتر، TDR و ساير وسايل اندازه‌گيري رطوبت خاک را ندارند. با توجه به محدوديت دسترسي به لايسي‌مترهاي وزني و زهکش‌دار در اکثر مزارع کشاورزي، تعيين نياز آبي گياه از طريق محاسبه تبخير-تعرق مرجع و ضريب گياهي، روشي مرسوم و پُرکاربرد است. گلرنگ به علت دارا بودن بيش از 90 درصد اسيدهاي چرب غير اشباع، به‌ويژه اسيد لينولئيک و اسيد اولئيک مي‌تواند نقش مهمي در گسترش سطح زير کشت گياهان روغني و تأمين دانه‌هاي روغني در کشور داشته باشد. هدف پژوهش حاضر تعيين تبخير-تعرق و ضريب گياهي گلرنگ در شرايط بدون کمبود آب و شوري و هم‌چنين در شرايط تنش شوري و خشکي در گلخانه بود.
روش پژوهش: پژوهش حاضر به‌صورت فاکتوريل و در قالب طرح کاملاً تصادفي با سه تکرار در گلخانه تحقيقاتي مرکز آموزش عالي کاشمر انجام شد. تيمارهاي آزمايش سه رژيم آبياري 100، 75 و 50 درصد نياز آبي و چهار سطح شوري 7/0، 4، 8 و 12 دسي‌زيمنس بر متر بودند. به‌منظور اندازه‌گيري نياز آبي گلرنگ از 36 گلدان به عنوان لايسي‌متر کوچک استفاده شد. گلدان‌ها به‌صورت روزانه توزين و آبياري شدند و کسر رطوبت خاک آن‌ها از طريق اختلاف وزن گلدان در زمان آبياري با وزن همان گلدان در حالت ظرفيت زراعي گلداني به‌دست آمد. البته براي گلدان‌هاي تحت تنش خشکي، مقدار آب آبياري، 75 و 50 درصد مقدار آب آبياري براي گلدان‌هايي که به‌صورت کامل و بدون تنش خشکي آبياري شدند، در نظر گرفته شد. تبخير-تعرق گياه مرجع چمن نيز به‌صورت روزانه و با استفاده از دو گلدان که در آن‌ها چمن کشت شده بود، اندازه‌گيري شد. از تقسيم تبخير-تعرق گياه در يک فاصله زماني مشخص به تبخير-تعرق گياه مرجع در همان فاصله زماني، ضريب گياهي براي مراحل چهارگانه رشد گلرنگ به‌دست آمد. در تيمارهاي آبياري با آب شور، براي جلوگيري از تجمع نمک در محدوه ريشه گياه کسر آبشويي محاسبه و اعمال شد. رسم نمودارها و تحليل‌هاي آماري با استفاده از نرم‌افزارهاي اکسل، SPSS و سيگما پلات انجام شد.
يافته ها: نتايج تجزيه واريانس تبخير-تعرق گلرنگ نشان داد که شوري، خشکي، مرحله رشد و اثر توأمان آن‌ها بر تبخير-تعرق در سطح احتمال يک درصد (P<0.01) معني‌دار بود. با افزايش تنش شوري و خشکي تبخير-تعرق گياه به‌طور معني‌داري کاهش يافت. بيش‌ترين تبخير-تعرق در طول فصل رشد براي تيمار شاهد (يعني تيمار بدون کمبود آب و شوري) و به اندازه 5/269 ميلي‌متر و کم‌ترين مقدار آن در تيمار W2S3 و به اندازه 2/102 ميلي‌متر اتفاق افتاد. براي تمام تيمارهاي آزمايش، بيش‌ترين تبخير-تعرق گياه در مرحله مياني و کم‌ترين مقدار آن در مرحله اوليه رشد بود. مقدار ضريب گياهي گلرنگ در شرايط بدون کمبود آب و شوري، در مرحله ابتدايي، توسعه، مياني و پاياني رشد به ترتيب 55/0، 9/0، 26/1 و 85/0 به‌دست آمد. در شرايط تنش شوري و خشکي شديد ضريب گياهي گلرنگ در مرحله ابتدايي، توسعه، مياني و پاياني رشد به ترتيب به 07/0، 18/0، 3/0 و 13/0 کاهش يافت.
نتيجه گيري: با توجه به کاهش کمي و کيفي منابع آب زيرزميني در اکثر مناطق کشور و به خصوص در دشت ممنوعه بحراني کاشمر، تعيين دقيق نياز آبي گياهان زراعي و باغي و از جمله گياه دانه روغني و ارزشمند گلرنگ از اهميت بالايي برخوردار است. استفاده از لايسي‌مترهاي وزني و زهکش‌دار کوچک روشي دقيق در تعيين تبخير-تعرق گياهان به شمار مي‌رود اما محدوديت دسترسي به آن در بيش‌تر مزارع کشاورزي باعث شده است که پژوهشگران و مجريان طرح‌هاي آبياري اعم از سطحي و تحت فشار، براي محاسبه نياز آبي گياهان زراعي و باغي از ضرايب گياهي ارائه شده در نشريه شماره 56 فائو استفاده نمايند. نتايج تحقيقات زيادي نشان داده است که استفاده از ضرايب گياهي ارائه شده در نشريه فائو 56 منجر به بيش‌برآورد يا کم‌برآورد نياز آبي گياهان نسبت به شرايط واقعي و محلي مي‌شود لذا اين ضرورت احساس مي‌گردد که ضريب گياهي بر اساس شرايط اقليمي و محلي تعيين گردد. از طرفي تأثير تنش شوري و خشکي بر اين ضريب اهميت مطالعه و تعيين ضريب گياهي در مناطقي مانند دشت ممنوعه بحراني کاشمر که شوري آب آبياري و کاهش کمي آن کشاورزي منطقه را به مخاطره انداخته است، دوچندان مي‌نمايند. لذا پيشنهاد مي‌گردد به‌منظور مديريت صحيح و کارآمد منابع آب، ضريب گياهي در شرايط تنش شوري و خشکي براي گياهان زراعي با ارزش اقتصادي بالا مانند گياه دانه روغني گلرنگ تعيين شود.
Background and Aim: It is essential to know the water requirement, which is a function of the type of plant and meteorological parameters in order to irrigation scheduling. Due to the direct measurement of water consumption, weighting and drainage microlysimeters are the most accurate method for calculating evapotranspiration. As the access to weighting and drainage lysimeters in most agricultural fields is limited, determination of plant water requirement by calculating the reference evapotranspiration and plant coefficient is a common and widely used method. The objective of the present study was to determine the evapotranspiration and crop coefficient of safflower in conditions without water and salinity stresses and also in conditions with salinity and drought stress in greenhouse.
Method: The present study was done as factorial in a form of completely randomized design with three replications in greenhouse research at Kashmar higher education institute. The experiment treatments were three irrigation regimes including 100, 75 and 50 percent of water requirement and four salinity levels including 0.7, 4, 8 and 12 dS m-1. In order to measuring safflower water requirement 36 pots were used as a microlysimetre. The pots were weighted and irrigated daily and soil deficit moisture was obtained through the difference of the pot weight at the time of irrigation with the weight of the same pot at the status of potted agricultural capacity. By dividing plant evapotranspiration in a specific time interval to reference plant evapotranspiration in the same time interval, the plant coefficient for the four stages of safflower growth was obtained. Graphs drawing and statistical analysis were done using Excel, SPSS and Sigma Plot software.
Results: The results of variance analysis of safflower evapotranspiration showed that salinity, drought, growth stage and their combined effects on evapotranspiration were significant at the probability level of one percent (P<0.01). With the increase of salinity and drought stress, plant evapotranspiration decreased significantly. The highest evapotranspiration during the growing season was occurred for the control treatment (i.e. the treatment without water and salinity deficit) by amount of 269.5 mm and the lowest amount of it was observed in the W2S3 treatment by amount of 102.2 mm. For all of the experimental treatments, the highest plant evapotranspiration was observed in the middle stage and the lowest of it was seen in the early stage of growth. The value of crop coefficient of safflower in the conditions without water and salinity deficit, in the initial, development, middle and final stages of growth was obtained as 0.55, 0.9, 1.26 and 0.85 respectively. Under severe drought and salinity stress, safflower crop coefficient decreased to 0.07, 0.18, 0.3, and 0.13, in the initial, development, middle, and final stages of growth respectively.
Conclusion: Due to the quantitative and qualitative reduction of underground water resources in most regions of the country, especially in the forbidden plain of Kashmir, accurate determination of the water requirements of agricultural and garden plants, including the valuable oilseed plant safflower, is of great importance. The use of weighting and drainage microlysimeters is considered as an accurate method in determining the evapotranspiration of plants, but the limited access to them in most agricultural fields has caused researchers and implementers of irrigation projects, both surface and pressurized irrigation, to calculate the water requirement of agricultural and garden plants used the crop coefficients presented in FAO irrigation and drainage paper No.56. The results of many researches have shown that the use of crop coefficients presented in FAO irrigation and drainage paper No.56 leads to overestimation or underestimation of the water requirement of plants compared to real and local conditions. Therefore, it is felt necessary to determine the crop coefficient based on local and climatic conditions. On the other hand, the effect of salinity and drought stress on this coefficient doubles the importance of studying and determining the crop coefficient in areas such as the critical forbidden plain of Kashmar, where irrigation water salinity and its quantitative decrease have endangered the agriculture of the region. Therefore, in order to properly and efficiently management of water resources, it is suggested to determine the crop coefficient in the conditions of salinity and drought stress for agricultural plants with high economic value such as safflower oilseed plant.
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