Subsurface drip irrigated broccoli received experimental combinations of N rate (176 and 268 lb N/ac, and fertigation frequency (daily, weekly, bi-weekly, monthly) at the Maricopa Agricultural Center during winter 1998-99. Marketable broccoli yields were increased slightly with N applications of 268 lb/acre compared to 176 lb/acre. However, neither marketable yield, head diameter, nor petiole nitrate concentrations were significantly affected by fertigation frequency. Nitrogen fertigation frequency does not seem to be a critical management variable for subsurface drip irrigated broccoli grown on medium-textured soils in Arizona.
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机译：在1998-99年冬季期间，地下滴灌西兰花在Maricopa农业中心接受了氮肥（176和268 lb N / ac，施肥频率（每天，每周，每两周，每月）施肥的试验组合，可销售的西兰花产量略有增加施氮量为268磅/英亩，而施氮量为176磅/英亩，但是施肥频率对市售产量，头径和硝酸盐叶柄浓度均无显着影响，氮肥施肥频率似乎并不是地下滴灌的关键管理变量。在亚利桑那州中等质地土壤上灌溉的西兰花。
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