世界银行：平衡肥料使用的产量收益：来自印度东部的证据（英文版）

As with most agricultural inputs, the optimal use of fertilizer leverages the production complementarities between different types of nutrients. Wide variation in the intensity of nutrient application rates suggests there are potentially large productivity gains to be had from rebalancing fertilizer use across nutrient types even under a fixed expenditure budget. Using detailed information on a large sample of rice fields across three states in eastern India, this paper investigates whether a