SCIT (Jengamvura): the Zimbabwean spot-irrigation system explained

In 2019, a PCAT engineer stood in Domboshava and described maize yields of 18 tonnes per hectare on experimental plots — in a country where smallholder averages routinely fall below two. The technology behind it is called Scientific Conservation Irrigation Technology (SCIT). It uses no exotic inputs, no electricity, and no large volumes of water. Its engine is compost, placed precisely in the ground.

This article tells you exactly what SCIT is, how it works mechanically, what the trial data showed — honestly — and what any farmer can apply from its principles right now, whether or not the full system is available to you.

Note on timing: SCIT was launched in July 2019. All commercialisation details in this article refer to plans stated at that launch. We do not know the current status of commercialisation or whether the system is available for purchase. If you want to enquire, contact HIT directly or speak to our team.

Two names for one technology

You may have heard this technology called Jengamvura. It is the same system.

In the published record it is SCIT — Scientific Conservation Irrigation Technology. That is the name The Herald used when HIT launched it in 2019 (The Herald / CFU Zimbabwe), and the name under which HIT’s EMRECC research centre lists it among its projects, describing it as using “zero tillage, vermi-ferts, and thermal compost, mulch and conservation pots” (HIT EMRECC).

Jengamvura is what it is called colloquially — the name you are more likely to hear spoken than to read. It is a field name rather than a published one, which is why searching for it turns up nothing. We lead with SCIT throughout this article because that is the name you can look up and verify for yourself; if Jengamvura is the name you know it by, you are in the right place.

SCIT at a glance


Full name	Scientific Conservation Irrigation Technology
Developed by	Joseph Ngirande, PCAT engineer and HIT lead researcher
Development time	Eight years of research prior to 2019
Launched	Domboshava, July 2019 — attended by Ministry of Lands, Agriculture, Water, Climate and Rural Resettlement officials and agriculture investors
Piloted	Chirumanzu and other locations, in collaboration between PCAT and HIT
Water use	1 litre per pothole, once per week
Pothole fill	Stick compost + vermicompost at a 2:1 ratio
Key inputs	Water, anthill soil, humus, cattle dung manure — all locally sourced
Crops excluded	Tobacco and potatoes
Experimental yield (maize)	18 t/ha on experimental plots (Chirumanzu trials)
Status at launch (2019)	Pre-commercialisation; estimated US$3.5 million needed to commercialise

Sources: The Herald / CFU Zimbabwe

The problem SCIT was built to solve

Zimbabwe’s rainfall is erratic, increasingly unreliable, and unevenly distributed. Even in a nominally adequate rain year, dry spells of two to three weeks during critical growth stages routinely cut yields. For farmers without access to boreholes, rivers, or the capital to sink an irrigation borehole, a dry spell is simply a lost crop.

The conventional response — surface or furrow irrigation — is water-hungry. FAO estimates surface irrigation systems operate at 40–60% efficiency; most of what is applied is lost to evaporation, runoff, and deep drainage before it reaches the root zone (FAO water-use efficiency). Conservation agriculture principles — minimum soil disturbance, permanent organic cover, precision inputs — directly attack this waste (FAO Zimbabwe).

SCIT’s starting point is the same as Zimbabwe’s Pfumvudza/Intwasa programme: stop treating the whole field as the unit of irrigation, and focus all your water and nutrients on the exact spot where the plant is. What SCIT adds is a precise compost-fill mechanism that stores and slowly releases that water across the week.

How SCIT works — the full mechanism

SCIT is described as “a hybrid system of integrating water conservation and nutrients recycling from organic matter using zero tillage or conservation agriculture method” (The Herald / CFU Zimbabwe).

In practice, here is what that means at the planting station level:

Step 1: The pothole

A planting pothole is dug at each plant position. The pothole is the irrigation unit — not the row, not the furrow, not the field.

Step 2: The compost fill

The pothole is filled with a specific compost mix: stick compost and vermicompost at a 2:1 ratio (The Herald / CFU Zimbabwe). These are both produced from locally available materials — water, anthill soil, humus, and cattle dung manure.

The two components each do a specific job:

Stick compost forms the bulk of the fill and acts as the primary moisture reservoir. Its organic materials absorb water and release stored moisture back to the soil as the surrounding soil dries — a slow, continuous release between waterings.
Vermicompost (worm compost) is the minority component at one part. The worms present in vermicompost excrete continuously, providing an additional source of moisture within the pothole. Vermicompost also adds a dense, biologically active layer of nutrients.

This is why compost is the engine of SCIT, not a supplement to it. The pothole does not work as a simple hole with a measured water input — it works because the organic matter stores the water, regulates its release, and simultaneously feeds the plant through the season. See our vermicomposting guide and making compost from farm waste for how to produce these inputs on your farm.

Step 3: Precise, trackable watering

Once the pothole is filled and planted, the farmer applies 1 litre of water per pothole, once per week (The Herald / CFU Zimbabwe). That is the entire water application. Because every unit of water input is the same across every pothole, total water use per hectare is straightforward to calculate and track — a key advantage over surface methods where actual application is hard to measure.

As Ringson Chitsiko, permanent secretary in the Ministry of Lands, Agriculture, Water, Climate and Rural Resettlement, put it at the launch: the technology uses “precise quantities of water” and is “ground-breaking” and “easily implementable in small scale farming communities” (The Herald / CFU Zimbabwe).

The zero-tillage dimension

SCIT operates under zero tillage / conservation agriculture — the soil between potholes is not disturbed. This protects soil structure, retains residue, and reduces the evaporation that bare-soil tillage accelerates. It also dovetails directly with how Pfumvudza planting basins work — both are per-station farming approaches, and the principle of concentrating inputs on the plant position rather than broadcasting them across a field is the same in both systems.

The Chirumanzu results — and the honest framing

Here is the figure that made the 2019 launch newsworthy: “From our experiments in Chirumanzu we have seen that we can harvest as much as 18 tonnes of maize per hectare” — Joseph Ngirande, as quoted by The Herald (The Herald / CFU Zimbabwe).

The Herald article also states: “Yields of 18 tonnes of maize per hectare were achieved on experimental plots.”

What you need to know before you make any decision based on that figure:

These were experimental plots under research conditions, with researchers controlling inputs, timing, and management precision. They are not typical farmer yields under normal field conditions.
No multi-season, multi-location trial data was published with the 2019 launch story. We have a reported result from Chirumanzu, not a replicated agronomic trial.
Zimbabwe’s smallholder average for maize is well below 2 t/ha in most seasons, and Pfumvudza plots — Zimbabwe’s leading conservation agriculture programme — have achieved up to 7.8 t/ha under strict management in FAO-supported pilots (FAO Zimbabwe).
The 18 t/ha figure is a ceiling achieved under controlled experimental conditions. It is not a promise.

Ivan Craig, AgriSeeds sales and marketing director, offered a useful framework at the launch: “yield is determined by plant population per unit area. This technology achieves the required plant population which gives the yield” (The Herald / CFU Zimbabwe). In other words, SCIT’s claim is that the pothole system, by giving every plant the moisture and nutrients it needs precisely, allows the theoretical yield potential of the crop variety to be expressed. Whether that holds at scale and across seasons requires further field research — which, as of our writing in 2026, has not been published in peer-reviewed form that we can cite.

You can follow our /research page for updates on Zimbabwean field research as it becomes available.

Why compost is the engine — and the bridge to your own practice

The mechanism above makes one thing clear: SCIT is not primarily an irrigation delivery system. It is a compost-placement system with precise water application on top. The moisture storage and slow release that make 1 litre per week viable happen inside the compost fill, not in the soil or the water input.

This matters because compost’s water-holding capacity is not unique to SCIT. FAO research on compost in tropical environments shows that humus can hold many times its own weight in water, and compost-amended soils retain moisture significantly longer into dry periods than unamended sandy soils (FAO Soils Bulletin 56). The PCAT BLOCK C Organic Compost that we stock is PCAT’s ready-made compost product — it is not the same formulation as the specific stick compost + vermicompost 2:1 mix described in the SCIT trials, and we will not tell you it is. The trials used a two-component composted fill made on-farm from locally sourced materials. What BLOCK C and that trial mix share is the underlying mechanism: organic matter that holds and releases moisture while feeding the soil.

If you work compost into your planting stations — whether Pfumvudza basins, SCIT-style potholes, or any other per-station approach — you are applying the same principle that drives SCIT’s water efficiency: get the moisture reservoir into the ground, at the root zone, in organic form. See how much compost per crop for application rates by crop.

The soil-health bonus

Ivan Craig noted at the launch that SCIT “can help to balance the PH levels in the soil” because most Zimbabwean soils are acidic (The Herald / CFU Zimbabwe). This aligns with what applied compost research consistently shows: repeated organic matter application buffers soil pH over time and improves nutrient availability on the acidic, sandy soils that cover much of Zimbabwe’s communal farming land. Read more in understanding soil acidity in Zimbabwe and read your soil before you spend.

Crop compatibility and exclusions

SCIT can be used for all crops except tobacco and potatoes (The Herald / CFU Zimbabwe). No explanation for these exclusions was given in the 2019 launch coverage. For tobacco, the most likely factor is that Zimbabwe’s cured tobacco industry has strict quality specifications where soil amendments and irrigation method affect leaf chemistry — but that is our interpretation, not a stated reason. For potatoes, tuber crops have specific soil structure and drainage requirements that may conflict with the pothole method. We will not speculate beyond the stated exclusion.

For maize specifically, see our growing maize in Zimbabwe guide for complementary practices.

The organic export angle

Ngirande noted at the launch: “This will see Zimbabwe exporting more organic produce which are in high demand in European markets. Organic farming has so much value on the international market” (The Herald / CFU Zimbabwe). This is a real commercial dimension. European organic certification requires documented absence of synthetic inputs, and a compost-based, zero-tillage system like SCIT is structurally compatible with organic certification — though certification itself involves process, auditing, and cost that are separate from the farming method.

Commercialisation status — as at the 2019 launch

As of the July 2019 launch, Ngirande stated that approximately US$3.5 million was needed to commercialise the technology (The Herald / CFU Zimbabwe). He outlined plans for commercialisation tools including a potholing tractor, a spot-irrigation knapsack, and a spot-irrigation centre pivot. He also described a water-harvesting bay to collect rainwater and runoff for reuse.

We do not know whether this funding was secured or whether the technology is currently available commercially. Do not assume it is on sale or widely deployed. If you are interested in the SCIT system, your best starting points are:

HIT (Harare Institute of Technology): the lead research institution
PCAT (Power Conservation Agri-Clinic Trust): the trust that piloted the technology in Chirumanzu and co-developed it with HIT
Our contact page: we are happy to help you find current contacts if you cannot reach them directly

What you can do right now — without the full system

The SCIT principle is accessible to any farmer who has compost, a shovel, and a water container. You do not need the commercial system to apply the core idea:

Dig planting potholes at each plant position — the same spacing discipline as Pfumvudza basins (see Pfumvudza and rainwater harvesting).
Fill with compost — ideally a mix of mature compost and vermicompost if you have worm-farm capacity (see vermicomposting — worm farming in Zimbabwe). If not, quality stable compost builds the same moisture reservoir, more slowly.
Apply water precisely — a watering can or bucket at the pothole, not across the bed. One litre per station, twice or more per week depending on your crop and season (adjust to your conditions — do not take 1 litre/week as a universal prescription; SCIT achieved that under specific compost-fill conditions).
Leave soil between stations undisturbed — no tillage between potholes; mulch the surface instead (see mulching to beat dry spells).
Build organic matter over time — one season of this approach will help; three seasons of it will transform the structure and water-holding of your pothole soil.

PCAT BLOCK C is available now at US$20 for 50 litres — a practical starting point for compost-filling your planting stations if your on-farm composting supply is limited. Contact us to discuss quantities for your plot size.

Also see drip irrigation on a budget for complementary water-saving approaches you can combine with per-station compost application.

Frequently asked questions

What does SCIT stand for and who invented it? SCIT stands for Scientific Conservation Irrigation Technology. It was developed by Joseph Ngirande, a PCAT engineer who was also HIT’s lead researcher, after eight years of research. He was 34 at the time of the July 2019 launch at Domboshava (The Herald / CFU Zimbabwe).

Is the 18 t/ha maize yield something I can expect on my farm? No — and we will be direct about this. The 18 t/ha figure was achieved on experimental plots under research conditions in Chirumanzu, with precise management by researchers. It is not a typical or guaranteed farmer yield. Zimbabwe’s Pfumvudza programme, with strong government and FAO support, has recorded up to 7.8 t/ha on well-managed plots (FAO Zimbabwe), which itself is exceptional. Treat 18 t/ha as a data point about what is theoretically possible under controlled conditions — not a promise.

Can I grow potatoes or tobacco with SCIT? No. The 2019 launch coverage explicitly states SCIT cannot be used for tobacco or potatoes (The Herald / CFU Zimbabwe). All other crops are compatible.

Is SCIT the same as Pfumvudza? They share the same conservation-agriculture DNA — both use per-station planting, minimum tillage, and organic matter in the planting hole — but they are not the same system. Pfumvudza (also called Intwasa) is a government-promoted programme with specific basin dimensions and input recommendations, focused on rainfall capture. SCIT is a research-developed technology that adds a specific compost-fill formula and precise weekly water application. Think of them as close cousins, not the same programme. See Pfumvudza and rainwater harvesting for the Pfumvudza detail.

Is PCAT BLOCK C the compost that was used in the SCIT trials? No, and we will not claim it is. The SCIT trials used stick compost and vermicompost mixed at a 2:1 ratio, produced from locally sourced anthill soil, humus, and cattle dung manure. PCAT BLOCK C is PCAT’s commercially available compost product — a different formulation. Both are organic compost products with moisture-holding properties, but the trial used a specific on-farm-produced mix. If you want to replicate the trial approach as closely as possible, see making compost from farm waste and vermicomposting — worm farming in Zimbabwe.

Where can I get the full SCIT system today? We do not know. As of the 2019 launch, commercialisation was planned but required approximately US$3.5 million to proceed. We have no confirmed information on whether that funding was raised or whether the system is currently for sale. Contact HIT or PCAT directly, or ask us and we will try to help you find a current contact.

Do this now

Read the primary source — the full CFU-republished Herald article is at cfuzim.org/hit-launches-new-irrigation-system and takes five minutes to read.
Start a compost pile — SCIT’s mechanism depends on having quality organic matter. Begin building yours now: making compost from farm waste.
Set up a worm farm if you can — vermicompost is half the SCIT pothole fill: vermicomposting — worm farming in Zimbabwe.
Apply the principle this season — compost-filled planting stations plus precise, low-volume watering works with whatever tools you have. See the steps above.
Test your soil before spending on inputs — knowing your pH tells you whether your compost is doing pH work as well as moisture work: read your soil before you spend.
Follow the research — we publish verified, sourced agronomic research as it becomes available on /research.

PCAT BLOCK C Organic Compost — PCAT’s locally-made compost, available now at US$20/50L. The moisture-holding, soil-feeding foundation for per-station farming, whether you’re running Pfumvudza basins, SCIT-style potholes, or a market garden bed.