Simcha Blass

Simcha Blass (1897 to 1982) was the Polish-born Israeli water engineer who invented modern drip irrigation, the slow, precise, root-level watering method that lets farmers grow more food with a fraction of the water that flood or sprinkler irrigation requires. He spent the first half of his career building the physical water infrastructure of a state that did not yet exist, and the second half solving a problem that infrastructure alone could never fix: how to grow crops in land too dry and too poor in fresh water to support them by any conventional method. The company he founded to commercialize the idea, Netafim, now operates in 110 countries and has shipped more than 150 billion individual drippers. Roughly three-quarters of Israel’s own farmland runs on the system he built.

Who he was

Blass was born on 27 November 1897 in Warsaw, then part of the Russian Empire, and trained from age seventeen at the Wawelberg-Rotband mechanical-technical institute, earning his engineering credential there. In the late 1920s he settled at Kibbutz Deganya Bet in British Mandate Palestine and began consulting on Jordan River irrigation schemes, then opened his own hydrological engineering firm in Tel Aviv in 1930. Water, not politics, was his lifelong subject: he helped found Mekorot, the country’s national water company, and later founded Tahal, the state water-planning authority, and from 1948 to 1956 served as the new Israeli government’s chief water-affairs adviser and head of planning for the National Water Carrier, the pipeline and canal system completed in 1964 that still moves water from the Sea of Galilee to the arid center and south of the country. He died in Tel Aviv on 18 July 1982, at 84.

What he invented, and why it was hard

Furrow and sprinkler irrigation, the methods farmers had used for millennia, flood a field or spray it from above; a large share of that water evaporates, runs off, or waters weeds and bare soil instead of roots, and heavy application can salinate the topsoil over time. Blass’s idea inverted the problem: deliver water in slow, metered drops directly to each plant’s root zone through a network of tubing, so the plant absorbs up to 95 percent of what is applied instead of a fraction of it. The insight came, by his own long-told account, sometime in the early 1930s, when a farmer showed him one unusually large, seemingly unwatered tree; digging into the soil, Blass found a leaking pipe coupling nearby, its slow drip forming an onion-shaped bulb of moisture that had fed the tree’s roots for years while its neighbors went dry. The idea was simple to state and brutally hard to engineer: a dripper has to release water at a controlled, uniform rate through an opening small enough to conserve water but wide enough that mineral particles and roots do not clog it within a season, at low pressure, across tubing that might run hundreds of meters across a field. No cheap, durable, precisely moldable material existed to make that possible until the late 1950s, when inexpensive plastics became widely available.

The dated path, including the wasted decades

Blass could describe the physics of his idea in the 1930s, and he did, but it sat unrealized for nearly thirty years for lack of a workable material and, by most accounts, for lack of interest from an Israeli agricultural and scientific establishment skeptical that dripping water slowly onto soil could out-yield established methods. He returned to the problem in earnest around 1959 and 1960, working with his son Yeshayahu to design and patent the first practical plastic dripper, using friction and controlled pressure loss through long, narrow internal passages to regulate flow. By 1965, the year after the National Water Carrier’s completion, Blass needed a manufacturing partner and a place to prove the technology at scale. He found it at Kibbutz Hatzerim, a collective farming community in the Negev desert; on 10 August 1965 Blass and the kibbutz signed a contract founding Netafim, with Hatzerim holding an 80 percent stake to the Blass family’s 20 percent. Production of drippers and dripper lines began in January 1966, first sold to Israeli farms, then exported.

Netafim and the world-scale numbers

Today drip irrigation waters roughly 75 percent of all crops grown in Israel. Netafim, still headquartered at Kibbutz Hatzerim, now operates in 110 countries through 33 subsidiaries and 19 manufacturing plants, employs some 4,500 people, and has produced more than 150 billion drippers over its history, serving an estimated 8.5 million farmers and more than 10 million hectares of irrigated land worldwide, from water-stressed regions of India and sub-Saharan Africa to industrial agriculture in the United States and Australia. It grew into a global industry worth billions of dollars a year, one small country’s engineering response to its own aridity now feeding farms on every populated continent.

Why a besieged, arid country built this

Israel sits mostly on semi-arid and arid land, receives most of its rain in a few winter months, and for decades after 1948 had to feed a rapidly growing population while surrounded by states it was at war with, unable to import water-saving know-how or equipment from most of its neighbors and forced to generate its own. That combination of hard scarcity and enforced self-reliance runs through Blass’s whole career, from the National Water Carrier to the dripper: water in Israel was never abundant enough to waste, so the engineering culture that formed around men like Blass treated waste itself as the problem to be solved, an instinct closer to chutzpah, the willingness to challenge an established method because it is inefficient, than to any brochure about innovation. David Ben-Gurion’s vision of making the Negev desert bloom needed exactly this kind of unglamorous, decades-long engineering persistence to become literal rather than rhetorical. The honest complication sits in the deal itself: the invention that became a multi-billion-dollar global industry left its inventor with a minority stake in the company built on it, and by most accounts of his later years Blass felt the recognition and reward never matched what the idea was worth to the world. Later Israeli engineers, including Rafi Mehoudar, who redesigned the pressure-compensating dripper that made large-scale, uneven-terrain irrigation reliable, built directly on the platform Blass and Kibbutz Hatzerim created.