ABSTRACT

Arsenic (As) contamination in ground water is raising concerns due to indiscriminate irrigation for a large variety of crops. Therefore, it is a challenge to reduce As uptake in relation to safe human consumption either by reducing water supply or by improving water quality without major yield losses. The experiment was laid out in Randomized Block Design (RBD) replicated four times with five water management treatments viz. T₁ = 100% shallow tube well (STW), T₂ = 25% STW + 75% pond water (PW), T₃ = 75% STW + 25% PW, T₄ = 50% STW + 50% PW andT₅ = 100% PW with broccoli (cv. Green Magic) as a test crop in an As-affected village of Ghetugachi, West Bengal, India. Plant and soil samples were collected during harvesting. The calculated hazard quotient (HQ) suggests that despite having higher yield, As content in broccoli under T₁ is unfit for human consumption. T₂ having a low HQ (0.564) and moderate crop water productivity (CWP) and irrigation water productivity (IWP) values (5.46 and 8.07, respectively) is marked as safest. T₄ with moderately high HQ (0.776) and fairly high CWP and IWP (5.62 and 8.31, respectively) can be considered for areas having relatively less contamination.

摘要

由于对多种作物的不加选择灌溉，地下水中的砷 (As) 污染引起了人们的关注。因此，通过减少供水或在不造成重大产量损失的情况下改善水质来减少与人类安全消费相关的砷吸收是一项挑战。该实验采用随机区组设计 (RBD) 进行，重复四次，五次水管理处理，即. T ₁  = 100% 浅管井 (STW), T ₂  = 25% STW + 75% 池塘水 (PW), T ₃  = 75% STW + 25% PW, T ₄  = 50% STW + 50% PW 和T ₅ = 100% PW，在印度西孟加拉邦 Ghetugachi 受影响的村庄中使用西兰花（品种 Green Magic）作为试验作物。在收获期间收集植物和土壤样品。计算出的危害商 (HQ) 表明，尽管产量较高，但 T ₁下西兰花中的 As 含量不适合人类食用。具有低 HQ (0.564) 和中等作物水分生产力 (CWP) 和灌溉水分生产力 (IWP) 值（分别为 5.46 和 8.07）的T _{2被标记为最安全。}对于污染相对较少的区域，可以考虑具有中等高 HQ（0.776）和相当高 CWP 和 IWP（分别为 5.62 和 8.31）的T _{4 。}