{"id":845,"date":"2026-05-15T06:33:50","date_gmt":"2026-05-15T06:33:50","guid":{"rendered":"https:\/\/foragebaler.com\/?p=845"},"modified":"2026-05-15T06:33:50","modified_gmt":"2026-05-15T06:33:50","slug":"hay-mower-cutting-height-and-blade-wear-setup-and-seasonal-guide","status":"publish","type":"post","link":"https:\/\/foragebaler.com\/it\/hay-mower-cutting-height-and-blade-wear-setup-and-seasonal-guide\/","title":{"rendered":"Hay Mower Cutting Height and Blade Wear: Setup and Seasonal Guide"},"content":{"rendered":"
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Mowing Equipment Reference<\/span><\/p>\n

Hay Mower Cutting Height and Blade Wear: Setup and Seasonal Guide<\/h1>\n

Cutting height is the most consequential mower adjustment you make, and most operators never change it from whatever the previous owner set. Too low: blades contact soil, contaminating hay with ash that fails elevator specifications and ruins forage test results. Too high: significant yield is left standing, and alfalfa crown buds are exposed to damage. The correct height is specific to your mower type, your crop, and the field condition each season \u2014 and it needs verification at the start of every cutting season.<\/p>\n

Height Setting Guide<\/a><\/p>\n<\/div>\n<\/div>\n

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Why Cutting Height Affects Both Quality and Stand Longevity<\/h2>\n

The cutting height of a hay mower determines two outcomes simultaneously: the yield captured in each cutting, and the long-term health of the stand being harvested. These two outcomes pull in opposite directions \u2014 lower cutting height captures more yield per acre, while higher cutting height preserves more crown tissue and reduces soil contamination. The management task is to find the cutting height that maximizes total season yield and quality across multiple cuttings over multiple years, not just the yield from a single pass.<\/p>\n

For alfalfa specifically \u2014 the crop most sensitive to cutting height \u2014 the crown and upper root zone contain the meristematic tissue from which all regrowth emerges after each cutting. Blades that cut within 1 inch of the soil surface contact and damage these crown buds, progressively reducing the stand’s capacity for vigorous regrowth. The yield advantage of a 1-inch cut over a 3-inch cut in a single season is 5\u201310%; the stand-life cost over five seasons from consistently cutting too low can be 30\u201340% reduction in productive stand life. The math strongly favors the higher cut for alfalfa in almost all commercial scenarios.<\/p>\n

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2\u20134 in<\/div>\n
Correct cutting height range for most alfalfa stands on well-prepared seedbeds<\/div>\n<\/div>\n
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+2\u20135%<\/div>\n
Ash content increase per inch of cutting height below 2 inches on average silt-loam soil<\/div>\n<\/div>\n
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5\u201315\u00d7<\/div>\n
Greater stand loss rate in alfalfa cut consistently below 1.5 in vs 3 in over a 5-year period<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Correct Cutting Height by Mower Type and Crop<\/h2>\n

\"mower<\/p>\n

Different mower types use different height-setting mechanisms, and the nominal setting on the adjustment indicator does not always correspond precisely to actual cutting height in the field \u2014 especially on uneven or soft ground. The critical check is always the actual stubble height measured in the field after the first 100-foot pass, not the setting on the adjustment scale.<\/p>\n

\n\n\n\n\n\n\n\n\n
Mower type<\/th>\nRecommended height
\n(alfalfa)<\/th>\n		Recommended height
\n(grass hay)<\/th>\n		Height setting mechanism<\/th>\nKey field verification<\/th>\n<\/tr>\n<\/thead>\n
Disc mower-conditioner<\/td>\n2.5\u20133.5 in<\/td>\n2\u20133 in<\/td>\nSkid shoe height or cutterbar lift cylinder adjustment. Skid shoes wear and raise effective cutting height over time.<\/td>\nMeasure stubble height after first pass; check skid shoe wear annually<\/td>\n<\/tr>\n
Sickle bar mower<\/td>\n2\u20133 in<\/td>\n2\u20133 in<\/td>\nShoe or skid plate adjustment at the cutterbar ends. Ground-following ability is limited; height varies with terrain more than disc mowers.<\/td>\nMeasure at multiple points across field; height is less consistent than disc mower<\/td>\n<\/tr>\n
Rotary mower (flail)<\/td>\n3\u20134 in<\/td>\n2.5\u20133.5 in<\/td>\nRear roller or skid shoe height; many models have limited fine adjustment below 3 in due to ground clearance design.<\/td>\nCheck for soil contact marks on flail tips; any soil contact visible = height too low<\/td>\n<\/tr>\n
Mower-conditioner
\n(roller type)<\/td>\n		2.5\u20133.5 in<\/td>\n2\u20133 in<\/td>\nHeader float and skid shoe combination. Header float setting affects how aggressively the cutterbar follows ground contours; improper float causes height variation on rolling terrain.<\/td>\nVerify header float allows ground following without scalping knolls<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
The stubble height measurement rule:<\/strong> After the first 100-foot pass of every new season, stop and measure actual stubble height at 5 points across the cut width and at 5 intervals along the pass. Average the 25 measurements. This average is your actual cutting height \u2014 not the setting on the adjustment lever. Skid shoes wear 0.1\u20130.3 inches per season, gradually raising the cutterbar above the nominal setting and producing higher-than-intended stubble. After a full season, the “2.5-inch” setting may actually be producing 3.2-inch stubble because the skid shoes have worn down.<\/div>\n<\/div>\n
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Cutting Height and Ash Content: The Direct Quality Connection<\/h2>\n

\"mower<\/p>\n

The relationship between cutting height and ash content in the finished hay is direct and measurable. Blade tips that contact or approach the soil surface carry a boundary layer of suspended soil particles upward into the cut swath with each revolution. This soil contamination is distributed throughout the swath during the cutting pass and cannot be removed by any subsequent field operation \u2014 it remains in the hay through raking and baling.<\/p>\n

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Ash content by cutting height<\/div>\n

Research comparing ash content in alfalfa cut at different heights on silt-loam soil shows:<\/p>\n