农业径流增加，有时比传统农业高10倍，最近的农业实践称为塑料栽培，使用不透水的塑料薄膜作为覆盖物。这种特性增加了农药进入邻近水域的可能性，有时农药浓度比传统农业高得多。塑料栽培现在被用于西红柿和各种行间作物，包括草莓、青椒、茄子、瓜类、甜玉米和黄瓜。塑料栽培的使用在全国范围内不断增加；例如，北卡罗来纳州通过塑性栽培和干燥相结合的方式将番茄产量提高了两倍。与传统农业相比，塑料栽培系统的主要优点是显著提高了可销售蔬菜的产量。 其他优势包括杂草控制、尽量减少除草剂使用、土壤温度控制、增强抗病性、肥料稳定和水分控制。与传统农业相比，塑料栽培田降低了土壤的渗透性，增加了径流。本研究的目的是评估番茄栽培场径流中的水质。在弗吉尼亚州东部的多个农业和河流采样点采集了现场样本。包括5个参考文献、表格、图表。

Increased agricultural runoff, sometimes up to 10 times higher than conventionalagriculture, have been found with a recent agricultural practice calledplasticulture, which uses an impermeable plastic sheet as a mulch. Thischaracteristic increases the chance that pesticides will enter adjacentwaterways, sometimes at much higher concentrations than conventional agriculture.Plasticulture is now being used on tomatoes and a variety of row crops includingstrawberries, green peppers, eggplants, melons, sweet corn, and cucumbers. Theuse of plasticulture is increasing nationwide; as an example, North Carolina hastripled its tomato production from the combined use of plasticulture and dripirrigation. The main advantage of the plasticulture system over conventionalagriculture is that it significantly increases marketable vegetable yields. Otheradvantages include weed control, minimized herbicide use, soil temperaturecontrol, increased disease resistance, fertilizer stabilization, and moisturecontrol. Plasticulture fields have been shown to have reduced permeability torain and increased runoff compared to conventional agriculture. The objective ofthis research was to evaluate the water quality in runoff from tomatoplasticulture fields. Field samples were obtained at a variety of agriculturaland stream sampling sites in eastern Virginia. Includes 5 references, table, figures.