کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4478636 1622936 2014 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Predicting reference evapotranspiration for screenhouse-grown crops
ترجمه فارسی عنوان
پیش بینی تبخیر تعرق مرجع برای محصولات دانه ای که در حال رشد است
کلمات کلیدی
تابش خورشیدی، تابش خالص، عبور، جزء اجباری، جزء شعاعی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم زراعت و اصلاح نباتات
چکیده انگلیسی


• ETo was estimated under three different screenhouses and compared to outside ETo.
• ETo reduction was quantified by means of two factors, ζrad and ζadv, related to ETrad, and ETadv respectively.
• ζrad was found to depend linearly on the screenhouse transmittance τ and ζadv on the wind ratio ω.
• A model was proposed for estimating screenhouse ETo based on outside ETrad, and ETadv, τ and ω.

The purpose of the study is to estimate the reference evapotranspiration of screenhouse-grown crops (ETo,in) from routine outside weather data and main screenhouse characteristics. To this aim, all the microclimatic variables required to calculate ETo,in by means of the standard FAO-56 Penman–Monteith formula were measured under three cultivated (sweet-pepper, spring–summer cycle) screenhouses for a two months period observation (Aug–Sept 2012) in a Mediterranean climate (Eastern Central Greece). The screenhouses differed in transmittance to solar radiation (τ) and wind ratio (ω = ratio of inside-to-outside wind speed): (i) a pearl insect-proof screen (IP-1, τ ≈ 0.76, ω ≈ 0.19), (ii) a white insect proof screen (IP-2, τ ≈ 0.58, ω ≈ 0.20), and (iii) a green shade-screen (GS, τ ≈ 0.56 and ω ≈ 0.43). We quantified and analysed at daily scale the evolution of the radiative (ETrad,in) and advective (ETadv,in) components of ETo,in, ETrad,in and ETadv,in were expressed as a function of the corresponding outside values (ETrad,out and ETadv,out) through two reduction ratios (ζrad = ETrad,in/ETrad,out and ζadv = ETadv,in/ETadv,out). ζrad and ζadv could be expressed as linear functions of τ and ω respectively. Based on this finding, we proposed an additive model of the form ETo,in = ζrad ETrad,out + ζadv ETadv,out. The predictive performance of the model was fair (RMSE = 0.11 mm day−1). The proposed model, based only on outside climate data and the knowledge of two screenhouse-related parameters, provides a straightforward way to estimate screenhouse ETo, a necessary step towards the determination of screenhouse-crops water requirements.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agricultural Water Management - Volume 143, September 2014, Pages 122–130
نویسندگان
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