Walk past almost any zero-grazing unit in Kenya and you will see it: a block of tall Napier grass behind the cow shed, a panga leaning on the wall, and a heap of freshly cut stems by the trough. Napier is the backbone of smallholder dairy feeding because it grows fast, regrows after cutting and produces a great deal of green material from a small plot. It is also one of the most mismanaged crops on the farm.
The common pattern is easy to recognise. The plot is planted with whatever canes a neighbour can spare, cut whenever the cows are hungry rather than when the grass is ready, left to grow head-high and woody between cuts, and fed whole so the cows pick the leaves and trample the stems. The plot ends up producing far less useful feed than it could, and the farm buys more dairy meal to make up the gap.
The short rains are a good time to fix this, because they are a good time to plant new Napier and to rehabilitate old stands. This guide covers establishing a plot properly, when and how to cut, why chopping matters, and a worked example of how much Napier one cow needs, with every assumption stated so you can redo the sum for your own farm. Spacings, cutting heights and intervals below are general guidance; your county livestock or agriculture extension officer can give the figures for your area and variety.
Start Clean: Planting Material and the Two Diseases
The single most important decision in a new Napier plot is where the planting material comes from. Two diseases have damaged Napier across large parts of Kenya. Napier stunt makes plants yellow, stunted and bushy, with many thin, short tillers, and it is spread by small insects called leafhoppers. Napier head smut produces thin stems and black, sooty growth, and badly affected stools decline until they are not worth cutting. Both travel on planting material taken from infected plots.
Take canes or splits only from vigorous, healthy stands with no yellow, stunted or smutted stools, and preferably from a source your extension office recommends. Research organisations in Kenya, including KALRO, have worked on varieties with better tolerance to these diseases; ask your extension officer which are recommended and available in your county. If a stool in an existing plot shows stunt or smut symptoms, the usual advice is to uproot it completely and destroy it, so it does not infect the rest.
Establishing the Plot in the Short Rains
Napier can be planted from stem cuttings (canes) or from root splits, which are rooted pieces divided from an existing stool. Splits usually establish faster because they already have roots. Cuttings are easier to transport in quantity. For cuttings, use mature canes and cut them into pieces with about three nodes each. Plant each piece at an angle, with two nodes in the soil and one above it, and press the soil firmly around it. Plant at the onset of the rains, once the soil is moist, so the cuttings have the whole season to root.
Napier is a heavy feeder. It is cut several times a year and each cut removes a large load of nutrients from the soil, so the plot needs organic matter from the start. Most farmers place well-rotted manure in the planting furrow or hole and mix it with the soil before planting. Your extension officer can advise on fertiliser rates if your soil needs more than manure.
Spacing varies with rainfall, soil and planting method. Spacings found in Kenyan extension material commonly fall somewhere between about 50 centimetres and 1 metre between plants and between rows. Closer spacing covers the ground faster and suppresses weeds sooner; wider spacing is easier to weed and manure, and suits drier areas. The Tumbukiza method, in which Napier is planted in pits filled with manure and topsoil, is another widely promoted option in Kenya, especially on small or less fertile plots. Whatever the layout, run rows across the slope on sloping land, and keep the plot close to the cow shed so the daily carry is short.
Keep the young plot weeded until the Napier closes over the gaps. Weeds compete hard with young Napier for water and nutrients, and a plot left weedy in its first months may never fully catch up. Fill any gaps where cuttings failed early in the season, while the soil is still moist.
When to Cut: Height, Not Hunger
Napier changes as it grows. Young growth is leafy, soft and more nutritious, but there is not much of it. As the plant grows taller it produces more bulk, but more of that bulk is stem, the stems get harder, and the feeding value of each kilogramme falls. Left to grow head-high or more, Napier becomes woody canes that cows refuse or chew slowly, and much of the plot's growth ends up as waste in the trough.
A widely used rule of thumb in Kenya is to cut Napier when it is about one metre tall, roughly waist height on an adult. The first cut of a new plot is usually taken when it first reaches this height, which in good conditions is often a few months after planting; give the plot time to build roots rather than cutting early. In a good growing season, regrowth to the same height commonly takes six to eight weeks, longer in dry or cold weather.
How low you cut matters as much as when. The usual advice is to cut close to the ground, leaving a short stubble of roughly 5 to 10 centimetres. A low cut makes the plant send up new tillers from the base, which keeps the stool dense and leafy. A high cut, at knee height, leaves stems that regrow from the upper nodes, producing thin, stemmy growth and a stool that gets taller and weaker each cut. Use a sharp panga and a clean, sloping cut so water runs off the stub rather than sitting on it.
Cut in Strips, Not in Panic
The way to keep a plot in the cutting zone is to divide it. Split the Napier into strips or blocks, and cut one strip at a time, moving across the plot day by day. By the time you return to the first strip, it should have regrown to about a metre. If the plot is too small to give that rotation, the cows need more land, a bought supplement or conserved fodder, and the plot will tell you this by always being cut too young.
Feed the plot after each cut. Spread well-rotted manure or slurry along the cut rows, or apply fertiliser as your extension officer advises, and keep the strips weeded. A plot that is cut repeatedly and never fed declines, and many old Napier plots that "stopped yielding" were simply starved.
Why Chopping Pays: Less Selection, Less Waste
Cows fed whole Napier stems do what any animal does with a mixed meal: they eat the best parts first. They strip the leaves and soft tips, chew some of the stem, and leave the hard lower canes in the trough or on the floor, where they get trampled into bedding. The plot grew all of that material, and the labour of cutting and carrying it was spent, but a share of it never became milk.
A chaff cutter cuts the whole stem into short pieces so that leaf and stem are mixed and the cow cannot easily sort one from the other. More of what was cut gets eaten, troughs stay cleaner, and chopped Napier mixes easily with other feeds such as legumes, crop residues or dairy meal. Chop length matters: very long pieces still allow sorting, while very fine chopping costs power and time. Our guide to choosing a chaff cutter covers chop length and sizing the machine to your daily volume, and our chaff cutter maintenance guide explains why sharp blades and correct clearance give a clean cut rather than a crushed one.
Chopped Napier also has a second use. When the plot is ahead of the herd in the rains, surplus Napier can be chopped and conserved as silage for the dry season instead of being left to grow woody. Our guide to making silage in Kenya explains the process.
How Much Napier Does One Cow Need? A Worked Example
Planning the plot starts with the herd's appetite. The cleanest way to estimate it is through dry matter, the part of the feed left when the water is removed, because that is what feeds the cow. The example below uses round, stated assumptions; your vet, nutritionist or extension officer can give figures for your own animals.
Follow the sum through. A 400 kilogramme cow eating dry matter at about 3 percent of her body weight needs about 12 kilogrammes of dry matter a day. If Napier supplies 70 percent of that, with the rest from dairy meal, legumes or crop residues, Napier must supply 8.4 kilogrammes of dry matter. Fresh Napier is mostly water; if the cut grass is 15 percent dry matter, the cow needs 8.4 divided by 0.15, or 56 kilogrammes of fresh Napier a day. That is about 1.7 tonnes a month and about 20 tonnes a year, for one cow.
Two lessons come out of that number. First, the daily carry is heavy, which is why the plot belongs next to the shed and why a chaff cutter that makes all of it edible matters. Second, wet-season Napier is often wetter than 15 percent dry matter, so a cow can fill her stomach with water and still fall short of dry matter. That is one reason intake and milk can dip in the rains even when the trough looks full.
Measure Your Own Plot Instead of Guessing
To know how much land a cow needs, you need your own plot's yield, and that varies so much with soil, rainfall, variety and management that a borrowed figure is close to useless. Measuring it takes an hour. When a strip is ready to cut, mark out 10 metres of row, cut it at your normal height, and weigh everything on a platform or hanging scale. The area of that sample is 10 metres times your row spacing. Divide the weight by the sample area to get kilogrammes per square metre per cut, and multiply by the area of the whole plot.
Keep a record of how many times a year each strip is cut, and you have your plot's annual yield. Divide the herd's annual need from the worked example by that figure, and you know whether the plot can carry your cows or whether you need more land, more manure on the land you have, or a supplement. Repeat the sample in the dry season too, because the gap between wet and dry months is what silage and hay exist to fill.
Tools for the Napier Plot, With Prices
These are current prices from the Fuga price list; confirm stock with the team before you travel. The Shankar models and the 2 blade chaff cutter sit at the lower end of the price range, and the high speed models are aimed at larger daily volumes; tell us your herd size and we will suggest the right one.
| Item | Stock code | Price |
|---|---|---|
| CHAFF CUTTER 2*2 SHANKAR | 6149 | KSh 28,000 |
| CHAFF CUTTER 3*2 SHANKAR | 6150 | KSh 38,000 |
| CHAFF CUTTER 3*3 SHANKAR | 6151 | KSh 40,000 |
| 2 Blade Chaff Cutter | No code | KSh 45,000 |
| HIGH SPEED CHAFF CUTTER 2T ELECTRIC | 7103 | KSh 100,000 |
| BLADE - CHAFF CUTTER | 6129 | KSh 800 |
| PANGA ALLIGATOR CURVED 18" | 6322 | KSh 350 |
| 100 KGS WEIGHING SCALE RAM G | 6526 | KSh 6,500 |
Plant clean material at the onset of the short rains, feed the soil, cut at about a metre and close to the ground, rotate the strips, chop what you cut, and weigh a sample so your plan rests on your own numbers. For help matching a chaff cutter to your herd, or for a sharp panga and a scale, talk to any Fuga branch or WhatsApp 0716 961 018. For the rest of the unit, our guide to setting up a zero-grazing dairy unit covers troughs, layout and water.
Key Takeaways
- Start with clean planting material from healthy stands; Napier stunt and head smut travel on canes taken from infected plots.
- Plant canes or root splits with manure at the onset of the rains, keep the young plot weeded, and run rows across the slope.
- As a rule of thumb, cut at about one metre tall and close to the ground, leaving a short stubble so new tillers come from the base.
- Divide the plot into strips and cut one at a time, feeding the plot with manure after each cut.
- Chopping with a chaff cutter stops cows picking out leaves and leaving stems, so more of what you cut becomes feed.
- Work out the herd's need from dry matter, then cut and weigh a 10 metre sample to find your own plot's yield instead of guessing.
Frequently Asked Questions
When should I plant Napier grass in Kenya?
Plant at the onset of a rainy season, once the soil is moist, so the cuttings or splits have the whole season to root. The short rains are a good time to plant new plots or fill gaps in old ones. Use clean planting material from healthy stands, put well-rotted manure in the planting hole or furrow, and keep the young plot weeded until it covers the ground.
At what height should Napier be cut?
A widely used rule of thumb in Kenya is to cut when the grass is about one metre tall, roughly waist height. Earlier gives little bulk; much later gives woody stems that cows waste. Cut close to the ground, leaving a short stubble of roughly 5 to 10 centimetres, so the plant regrows from the base. Your extension officer may advise a different height for your variety.
How do I recognise Napier stunt and smut?
Napier stunt makes plants yellow, stunted and bushy, with many thin, short tillers. Head smut produces thin stems and black, sooty growth, and affected stools decline. The usual advice is to uproot affected stools completely and destroy them, never to use them as planting material, and to replant with clean material of a variety your extension office recommends.
Is it worth chopping Napier with a chaff cutter?
For most zero-grazing units, yes. Cows fed whole stems eat the leaves and leave the hard stems in the trough or on the floor. Chopping mixes leaf and stem so there is less sorting, troughs stay cleaner and chopped Napier mixes easily with other feeds. It also makes it possible to conserve surplus Napier as silage in the rains.
How much land do I need for Napier per cow?
It depends on your plot's yield, which varies widely with soil, rainfall, variety and management, so measure it. Cut and weigh 10 metres of row at cutting height, convert to kilogrammes per square metre, multiply by the plot area and by the number of cuts a year. Compare that with the herd's annual need, worked out from dry matter as in the example in this article, and you know whether the plot is big enough.
