This study aimed at determining the effects of different irrigation water amounts and nitrogen (N) doses using surface drip irrigation (DI) and subsurface drip irrigation (SDI) systems on yield and quality (pH, total soluble solids, titratable acidity, ascorbic acid content, fruit dry matter, fruit length, fruit diameter, number of fruits), water–yield functions, water productivity (WP) and seasonal evapotranspiration of pepper (Capsicum annuum L.). Effects of different irrigation systems, different irrigation regimes (full irrigation, FI; deficit irrigations, I₇₅ and I₅₀ receiving respectively 75 and 50% of FI) and four different N doses through fertigation (N₀: unfertilized, N₇₀: 70 kg N ha⁻¹, N₁₄₀: 140 kg N ha⁻¹, N₂₁₀: 210 kg N ha⁻¹) on yield and quality parameters of pepper were investigated for 2 years (2015 and 2016) in the Ankara province of Turkey. The results show that SDI had greater yields than DI. The greatest WP was obtained from SDI I₅₀ N₂₁₀ and the lowest in DI FI N₀. I₇₅ N₁₄₀ treatment could be used through fertigation in SDI in the case of no water shortage for higher yields and better quality attributes and I₅₀ N₂₁₀ could be used in the case of water scarcity, both to have reliable or acceptable yield.

中文翻译：

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使用地表和地下滴灌评估不同灌溉和施氮对辣椒土壤含水量和产量质量参数的影响*

本研究旨在确定使用地表滴灌 (DI) 和地下滴灌 (SDI) 系统的不同灌溉水量和氮 (N) 剂量对产量和品质（pH、总可溶性固体、可滴定酸度、抗坏血酸含量）的影响, 果实干物质, 果实长度, 果实直径, 果实数量), 水分产量函数, 水分生产力 (WP) 和辣椒 ( Capsicum annuum L.) 的季节性蒸散量。不同灌溉系统、不同灌溉方式（全灌，FI；亏灌，I ₇₅和 I ₅₀分别接受 75% 和 50% FI）和四种不同 N 剂量（N ₀：未施肥，N 70：70 _kg）的影响N ha ^-1, N ₁₄₀ : 140 kg N ha ^-1 , N ₂₁₀ : 210 kg N ha ^-1 ) 在土耳其安卡拉省对辣椒的产量和质量参数进行了为期 2 年（2015 年和 2016 年）的调查。结果表明，SDI 的产量高于 DI。SDI I ₅₀ N ₂₁₀的 WP 最高，DI FI N ₀最低。I ₇₅ N ₁₄₀处理可在 SDI 中通过灌溉施肥在不缺水的情况下使用，以获得更高的产量和更好的质量属性，而 I ₅₀ N ₂₁₀可用于缺水的情况下，以获得可靠或可接受的产量。