{"id":1993,"date":"2020-08-14T16:19:14","date_gmt":"2020-08-14T16:19:14","guid":{"rendered":"https:\/\/agrilife.org\/texasrowcrops\/?p=1993"},"modified":"2020-08-14T16:19:14","modified_gmt":"2020-08-14T16:19:14","slug":"remaining-crop-stubble-after-harvest-your-options-and-a-myth","status":"publish","type":"post","link":"https:\/\/agrilife.org\/texasrowcrops\/2020\/08\/14\/remaining-crop-stubble-after-harvest-your-options-and-a-myth\/","title":{"rendered":"Remaining Crop Stubble after Harvest\u2014Your Options and a Myth"},"content":{"rendered":"<p>Dr. Calvin Trostle, Extension Agronomy, TAMU Dept. of Soil &amp; Crop Sciences, Lubbock, (806) 746-6101, <a href=\"mailto:ctrostle@ag.tamu.edu\">ctrostle@ag.tamu.edu<\/a><\/p>\n<p>August 13, 2020<\/p>\n<p>Producers across Texas know that field crop stubble on fields offers potential benefits.\u00a0 There is erosion control, the reduction of raindrop impact (protection of the soil surface), potential protection to a subsequent crop that is fragile in the seedling stage (e.g., cotton), etc.\u00a0 USDA-NRCS often uses a rating scale for fields with stubble to estimate the erodibility.\u00a0 Other programs through FSA may require at least 30% of the soil surface be covered with residues.<\/p>\n<p>&nbsp;<\/p>\n<p>But also, farmers note that in some instances substantial crop residues may curtail yields in a subsequent crop.\u00a0 Perhaps the most common concern is that high amounts of crop residues, especially if they are incorporated near the planting of the next crop, lead to a tie up of nitrogen thus reducing growth of the next crop, at least in key early growth stages where components of yield potential may be determined.\u00a0 College students in agronomy are often taught about the need to add supplemental N for a crop if there is a large amount of incorporated wheat stubble stimulating a great increase in soil microbial activity.\u00a0 For residues, like wheat, where the ratio of carbon to nitrogen is above 20:1 then microbes are scavenging nitrogen so they can grow.\u00a0 And if they are competing against a crop root the microbes win.\u00a0 The crop must wait for recycled N or have supplemental N applications.<\/p>\n<p>&nbsp;<\/p>\n<p>In general, farmers likely view crop residues as a means to reduce evaporation of existing soil moisture.\u00a0 This is generally true due to reduced wind speed at the soil surface, shading of the soil, etc.\u00a0 But there are instances where this might be detrimental.\u00a0 One example is published in Hockley\/Cochran\/Lamb AgriLife Extension IPM agent Kerry Siders\u2019 August 13, 2020 newsletter (<a href=\"https:\/\/hockley.agrilife.org\/newsletters\/ipm\/\">https:\/\/hockley.agrilife.org\/newsletters\/ipm\/<\/a>).\u00a0 In this example, wheat stubble appears to have potentially wicked moisture out of the soil thus reducing cotton yields.<\/p>\n<p>&nbsp;<\/p>\n<p>But in this example, the possible solution to the wheat stubble issue (or other residue) does <u>not<\/u> mean \u2018soil incorporation,\u2019 rather leaving the residues <u>on<\/u> the soil surface.\u00a0 This would apply to most crop residue decisions.\u00a0 Some farmers might like to think of the residue as a nutrient source, and they are correct.\u00a0 There is a short-term (incorporation) vs. long-term aspect (leave stubble standing\u2014no stalk cutting, no tillage) to this question.\u00a0 The intermediate term comparison is tillage or cutting operations that leave the stubble on the surface.\u00a0 This hastens breakdown, and in high residue situations this may be necessary at a minimum.\u00a0 But for growers across the Texas, the windier your production environment then increasingly is the value of standing stubble.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Your Planter Capability<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>What you as a farmer do with crop residues may depend on your planter and how it is equipped to plant into higher residues.\u00a0 (I will write later this year about my opinion on what a farmer\u2019s most important piece of equipment is and why.)\u00a0 A planter with the needed trash whippers, coulters, etc. enables you to plant into at least moderate residue environments.\u00a0 This gives you the farmer an option. \u00a0You may be able to eliminate an expensive\u2014and potentially erosive\u2014tillage operation.<\/p>\n<p>&nbsp;<\/p>\n<p>Most planters are equipped with some sort of disk to move stubble or soil for desired seed placement.\u00a0 Moving soil is more likely a priority in dryland farming in drier regions of Texas as you reach for sufficient soil moisture to germinate your seed.\u00a0 The disk opener itself can serve as a cutting coulter in many cases, and that is all that is needed (Fig. 1).<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1995\" src=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-1-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-1-300x225.jpg 300w, https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-1-1024x768.jpg 1024w, https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-1-768x576.jpg 768w, https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-1.jpg 1430w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p style=\"text-align: center;\"><strong>Fig. 1.<\/strong>\u00a0 Standard planter unit with no specialized equipment planting into thin sorghum\/sudan stubble, Lubbock Co., TX.\u00a0 In this instance the disk openers are doing a good job of cutting the stubble as the furrow is opened for cotton planting.\u00a0 Heavier stubble might require use of the trash whipper disks to clear a narrow band for planting.\u00a0 (This figure was published originally in an October 2018 Row Crops Newsletter on cover crops.)<\/p>\n<p>&nbsp;<\/p>\n<p>Higher biomass present on fields may present additional planting issues.\u00a0 Corn production produces so much residues in some instances that direct planting for a subsequent crop is difficult if not impossible.\u00a0 (But burning that residue or shipping it off as forage has a downside as well.)\u00a0 Biomass that is five tons per acre or more would need substantial soil contact\u2014surface contact, not necessarily incorporation) to degrade for ready planting the next year.<\/p>\n<p>&nbsp;<\/p>\n<p>Some dryland cover crop work in West Texas has produced several tons per acre of sorghum\/sudan stubble.\u00a0 A late fall observation might be \u201cHow could I possible plant into that next year?\u201d\u00a0 But after lots of wind and the gradual contact of residues with the soil, farmers at our demonstration sites agree they wouldn\u2019t have too much trouble planting into the stubble (Fig. 2).\u00a0 The key is having a coulter to cut the residues, so they don\u2019t hairpin around the planter unit.<\/p>\n<p>&nbsp;<\/p>\n<table style=\"width: 3.39788%; height: 20px;\">\n<tbody>\n<tr style=\"height: 10px;\">\n<td style=\"width: 1.22511%; height: 10px;\"><\/td>\n<td style=\"width: 35.7143%; height: 10px;\"><\/td>\n<td style=\"width: 44.8698%; height: 10px;\"><\/td>\n<td style=\"width: 35.7143%; height: 10px;\"><\/td>\n<\/tr>\n<tr style=\"height: 10px;\">\n<td style=\"width: 1.22511%; height: 10px;\"><\/td>\n<td style=\"width: 35.7143%; height: 10px;\"><\/td>\n<td style=\"width: 44.8698%; height: 10px;\"><\/td>\n<td style=\"width: 35.7143%; height: 10px;\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><a href=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1997\" src=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-2-300x239.jpg\" alt=\"\" width=\"300\" height=\"239\" srcset=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-2-300x239.jpg 300w, https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-2.jpg 664w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><a href=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-2.1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1996\" src=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-2.1-300x221.jpg\" alt=\"\" width=\"300\" height=\"221\" srcset=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-2.1-300x221.jpg 300w, https:\/\/agrilife.org\/texasrowcrops\/files\/2020\/08\/fig-2.1.jpg 715w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Fig. 2.<\/strong>\u00a0 November high sorghum\/sudan biomass from a summer cover crop with intent plant a spring crop into untouched biomass (Lamesa, TX).\u00a0 This looks difficult for later planting, but after a winter and spring of wind and some precipitation, direct planting conditions appear manageable without tillage if a planter is equipped properly.\u00a0 In this case area farmers said they would have no problem planting if they used a coulter to cut the biomass in front of the planter unit.<\/p>\n<p><strong>Plowing in Crop Residues for Organic Matter\u2014A Trostle Agricultural Pet Peeve<\/strong><\/p>\n<p>In my region of the Texas South Plains most farming is cotton.\u00a0 Cotton doesn\u2019t produce much residue, but more farmers now recognize that even allowing the cotton stalks to stand to near planting the next cotton crop offers some slight advantages on erosion protection.\u00a0 But more commonly in the low residue system of continuous cotton, occasionally the cotton fails, and farmers may plant grain sorghum as a catch crop.\u00a0 When that crop is harvested, the response of some farmers is to plow the sorghum assuming it will increase organic matter.\u00a0 Wait a minute!<\/p>\n<p>As one moves from humid to semi-arid regions of Texas, whether far south Texas back from the Gulf Coast, or through the Rolling Plains into the High Plains, soil organic matter levels decline.\u00a0 It is common in the Lubbock region to find soil test reports with 0.3% carbon (C) which would be about 0.5% organic matter (OM).\u00a0 This is unbelievably low.\u00a0 But if sorghum residues are plowed in that should increase OM?<\/p>\n<p>For example, a farmer ekes out a 2,000 lb.\/A catch crop sorghum yield on dryland near Lubbock after a failed cotton crop.\u00a0 That would be about 3,000 lbs. of dry matter from the stubble, leaves, and threshed head.\u00a0 That is somewhat marginal in protecting the soil from strong winds, but if left standing it can help.\u00a0 Is this a tradeoff versus incorporating the stubble?\u00a0 Yes, it is.\u00a0 And, importantly, because the typical soil in West Texas tends to be sandy it does not afford good stability to soil organic matter.\u00a0 <u>Tillage disturbs the little organic matter you have<\/u>.\u00a0 Yes, some of above-ground stubble if incorporated does become stable long-term organic matter.\u00a0 But the tillage operation disturbs some of the organic matter you already had.<\/p>\n<p>&nbsp;<\/p>\n<p>So, incorporating that stubble, at least in this drier situation, is likely and merely only an <strong>exchange<\/strong> of organic matter.\u00a0 It is probably <u>not<\/u> an increase in soil OM.\u00a0 And in the process you have lost the value of the residue to protect the soil from erosion.<\/p>\n<p>&nbsp;<\/p>\n<p>But there is a silver lining here:\u00a0 <u>the potential slow increase in soil organic matter in this scenario comes from the roots<\/u>.\u00a0 Left undisturbed this contributes to soil organic matter without the potential losses of what you already have.<\/p>\n<p>&nbsp;<\/p>\n<p>If you are in a wetter region of Texas and you have 2% or more organic matter, then consider that a blessing.\u00a0 It means you also have more rain.<\/p>\n<p>&nbsp;<\/p>\n<p>An Additional Downside to Reduced Stubble Value\u2014Harvesting for Forage<\/p>\n<p>&nbsp;<\/p>\n<p>Stubble harvest for forage may be an attractive source of additional income.\u00a0 Corn farmers in the Texas Panhandle often bale stalks to reduce biomass on the field so they can sometimes plant fall small grains.\u00a0 But apart from forage harvest reducing erosion protection, there is a hidden downside that too many growers don\u2019t consider.\u00a0 Crop residues that leave the field are removing nutrients from your cropping system.\u00a0 Is it a lot?\u00a0 Or a little?<\/p>\n<p>&nbsp;<\/p>\n<p>Most farmers that occasionally sell stubble, in contrast to a regular forage grower who is likely to account for nutrient removal in forages, usually don\u2019t count the replacement cost of the nutrients.\u00a0 For many stubbles of corn, grain sorghum, perhaps wheat, protein content can be in the range of 5 to 6%.\u00a0 For simplicity, in general 6.25% crude protein is about 1% N.\u00a0 So, for each ton of residue removed, you are taking off about 20 lbs. of N.\u00a0 At today\u2019s N cost that typically has a value of about $10-13 per ton.\u00a0 I estimate the value of all remaining nutrients (P, K, S, micronutrients) is about 1\/4 to 1\/3 the value of nitrogen.\u00a0 So, a ton of stubble may remove about $13-18 of nutrient value from your cropping system.<\/p>\n<p>&nbsp;<\/p>\n<p>Is the price you are receiving for the stubble\u2014which is not high\u2014accounting for this?\u00a0 When I ask farmers about it, most are not accounting for nutrient removal.\u00a0 If you are getting $30-40\/ton for the stubble, then as much as half of that income would be needed to replenish nutrients.\u00a0 The stubble sales may seem like free income, but it may not be a good deal.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dr. Calvin Trostle, Extension Agronomy, TAMU Dept. of Soil &amp; Crop Sciences, Lubbock, (806) 746-6101, ctrostle@ag.tamu.edu August 13, 2020 Producers across Texas know that field crop stubble on fields offers potential benefits.\u00a0 There is erosion control, the reduction of raindrop impact (protection of the soil surface), potential protection to a subsequent crop that is fragile in the seedling stage (e.g., cotton), etc.\u00a0 USDA-NRCS often uses a rating scale for fields with stubble to estimate the erodibility.\u00a0 Other programs through FSA may require at least 30% of the soil&#8230; <span class=\"read-more\"><a href=\"https:\/\/agrilife.org\/texasrowcrops\/2020\/08\/14\/remaining-crop-stubble-after-harvest-your-options-and-a-myth\/\">Read More &rarr;<\/a><\/span><\/p>\n","protected":false},"author":1756,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[115,65,144,148,147,1],"tags":[149],"class_list":["post-1993","post","type-post","status-publish","format-standard","hentry","category-115","category-agriculture","category-august-2020","category-crop-stubble","category-harvest","category-uncategorized","tag-crop-stubble"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Remaining Crop Stubble after Harvest\u2014Your Options and a Myth - Texas Row Crops Newsletter<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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