Dis-incentivizing sustainable intensification? The case of Zambia’s maize-fertilizer subsidy program
Dis-incentivizing sustainable intensification? The case of Zambia’s maize-fertilizer subsidy program
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赞比亚玉米肥料补贴计划是否会抑制可持续集约化？
DOI：
10.1016/j.worlddev.2019.05.003
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发表时间：
2019
影响因子：
6.9
通讯作者：
O. Zulu
中科院分区：
文献类型：
--
作者：
Stephen N. Morgan;Nicole M. Mason;N. Levine;O. Zulu
土壤肥力差和不断下降是撒哈拉以南非洲增加谷物产量的主要制约因素。虽然无机肥料投入补贴计划（ISP）是非洲政府用于增加小农谷物产量的流行而昂贵的工具，但用于促进其他土壤肥力管理（SFM）实践的资源要少得多，这些实践可以改善土壤健康，增加谷物产量对无机肥料的反应，并支持可持续农业集约化。此外，关于互联网服务提供商如何影响农民使用这种可持续森林管理做法，人们知之甚少。我们研究是否以及在何种程度上家庭参与赞比亚的玉米化肥补贴计划影响家庭的休耕，间作，轮作和动物粪便的使用。使用具有全国代表性的小组调查数据，从赞比亚的小农户，我们发现，赞比亚的玉米化肥补贴计划减少的概率和程度的休耕和间作玉米与其他作物。此外，我们发现一些证据表明，随着时间的推移，该计划诱导增加连续玉米种植在同一地块上，但是，证据的权重表明，没有统计学上显着的ISP的影响使用动物粪便。分析使用的Mundlak-Chamberlain设备来控制时不变的未观察到的异质性，并解决有关的问题，选择到补贴计划与工具变量/控制函数的方法的endoadministration。总的来说，我们的研究结果表明，赞比亚的玉米化肥补贴计划可能会抑制可持续集约化，而不是促进它。
Poor and declining soil fertility is a major constraint to increased cereal yields in sub-Saharan Africa. While input subsidy programs (ISPs) for inorganic fertilizer are a popular and expensive tool used by African governments to increase smallholder farmers’ cereal yields, far fewer resources are devoted to promoting other soil fertility management (SFM) practices that can improve soil health, increase cereal yield response to inorganic fertilizer, and support sustainable agricultural intensification. Moreover, little is known about how ISPs affect farmers’ use of such SFM practices. We examine whether and to what extent household participation in Zambia’s maize-fertilizer subsidy program affects the household’s use of fallowing, intercropping, crop rotation, and animal manure. Using nationally-representative panel survey data from Zambian smallholder farm households, we find that Zambia’s maize-fertilizer subsidy program reduces the probability and extent of fallowing and intercropping of maize with other crops. In addition, we find some evidence that the program induces an increase in continuous maize cultivation on the same plot over time; however, the weight of the evidence suggests no statistically significant ISP effects on the use of animal manure. The analysis uses the Mundlak-Chamberlain device to control for time-invariant unobserved heterogeneity and addresses concerns related to the endogeneity of selection into the subsidy program with an instrumental variables/control function approach. Overall, our results suggest that Zambia’s maize-fertilizer subsidy program may have dis-incentivized sustainable intensification rather than promoted it.
影响因子：
4.4
作者：
Maidment, Ross I.;Grimes, David;Black, Emily
通讯作者：
Black, Emily