Ushr (literally "one-tenth") is an Islamic agricultural tax, constituting one form of obligatory charity (zakat) on land produce. It applies to crops irrigated naturally by rain, rivers, or springs without significant human effort, requiring payment of 10% of the harvest. For land requiring artificial irrigation (wells, irrigation systems, water lifting), the rate is 5% (half of ushr). The Quran refers to this obligation: "And He it is who produces gardens... Eat of their fruit when they fruit and give its due on harvest day" (6:141). The Prophet Muhammad (peace be upon him) specified: "On what is watered by the sky and springs, one-tenth; on what is watered by irrigation, one-twentieth" (Bukhari). Ushr differs from zakat on wealth in several ways: it is due at harvest time rather than after a full lunar year; it applies to all agricultural produce, not only surplus; and it includes vegetables and fruits beyond the standard zakat categories. The revenue from ushr historically supported the poor, public works, and state functions in Islamic societies. In contemporary contexts, ushr remains practiced in some Muslim countries and communities as a form of agricultural welfare. Ushr reflects Islam's concern for comprehensive social justice, ensuring that even agricultural wealth circulates to benefit the entire community, particularly the poor and needy. The ushr system recognizes that those who cultivate land are often the most vulnerable, and by requiring a share of the harvest, it ensures that the poor receive sustenance without waiting for annual zakat cycles. The lower rate for irrigated land (5% vs. 10%) acknowledges the additional effort and expense of artificial irrigation, demonstrating Islamic law's consideration of economic realities. Ushr also encourages agricultural development,since the tax is on produce, not land, farmers are motivated to cultivate and improve productivity. The system ensures that food production benefits the community, not just individual landowners. In modern Islamic finance, the principles of ushr can inform agricultural policies, ensuring that small farmers are not burdened while still fulfilling social obligations. Ushr teaches that all wealth, including the earth's produce, carries a responsibility toward the community. It reinforces the Islamic principle that land is a trust from Allah, and those who benefit from it must share its blessings with those who have less. The system also emphasizes that worship extends beyond ritual prayer to include economic justice and social solidarity.