Deficiencies in water and nitrogen (N) can lead to poor crop growth and production. This study was carried out during 2012–2014 to determine (1) the effect of drip irrigation regimes and N fertilizer rates on root length density (RLD) of corn (Zea mays L. cv. Single cross 704) and soil moisture dynamics and (2) the relationship between root development and water availability. The experiment was arranged into a split-plot design with three irrigation regimes as the main factor (I₁ = 60, I₂ = 80, and I₃ = 100% evapotranspiration [ET_c]) and five levels of N fertilizer (N₁ = 0, N₂ = 50, N₃ = 100, N₄ = 150 and N₅ = 200 kg/ha) as the subfactor. The combination I₁N₄ produced the highest grain yield and yield components while I₃N₅ gave the lowest performance. The highest RLD was recorded at full irrigation water requirement and it increased with increasing N rate, but not in a linear trend, as higher N rates showed less effect. Nitrogen application under drip irrigation increased the RLD in soil depending on irrigation level. Soil moisture was optimized at full irrigation water requirement and 150 kg/ha N.

水和氮（N）缺乏会导致作物生长和产量下降。这项研究于2012年至2014年进行，以确定（1）滴灌制度和氮肥用量对玉米（Zea mays L. cv。Single cross 704）根长密度（RLD）和土壤水分动态的影响，以及（ 2）根系发育与水分供应之间的关系。将实验安排为分块设计，以三种灌溉方式为主要因子（I ₁  = 60，I ₂  = 80和I ₃  = 100％蒸散量[ET _c ]）和五种氮肥水平（N ₁  = 0，N ₂  = 50，N ₃  = 100，N ₄  = 150和N ₅ = 200 kg / ha）作为子因子。I ₁ N ₄组合产生最高的谷物产量和产量成分，而I ₃ N _5则提供最低的性能。最高RLD记录在全灌溉水需求下，并且随着N含量的增加而增加，但不是线性趋势，因为较高的N含量显示出较小的影响。滴灌条件下施氮增加了土壤中的RLD，具体取决于灌溉水平。在完全灌溉需水和150 kg / ha N的条件下优化了土壤湿度。