#PDF from Texas A&M saying #agriculture water #pricing is US$6 to US$98 per acre foot.
on 02026-04-23#ACOUP provides strong arguments that in #history peasants worked 2500 to 3000 hours per year, much more than many people do today. Also #agriculture has changed fundamentally: “As a rule, farming yields in the pre-modern are discussed not in terms of productivity per-land-area but rather in seed yields: for a given dry measure of seeds planted, how many of the same dry measure of seeds (because those are the tasty, edible parts of these plants) do you get back? So they are expressed in figures like 4:1 which means for every one modius/dry liter/bushel sown, four are harvested.” #economics
on 02026-03-21my comment on #fertilizers #energy use in #agriculture, citing Woods et al. #food
on 02022-05-21“#Energy and the #Food System”, Jeremy Woods, Adrian Williams, John K. Hughes, Mairi Black, and Richard Murphy, Philos Trans R Soc Lond B Biol Sci. 2010 Sep 27; 365(1554): 2991–3006. doi:10.1098/rstb.2010.0172 #agriculture #fertilizer
on 02022-05-21from “#Energy and the #Food System,” graph of Ontario #agriculture: grains and oilseeds mostly yield 30-90 GJ/hectare (I assume per year), but grain corn is up around 120, and switchgrass more like 170; fossil-fuel energy consumption is shown at the bottom as 10–20 GJ/ha.
on 02022-05-21“#Energy Inputs in #Food Crop Production in Developing and Developed Nations,” Pimentel’s #EROEI #paper where he found about four joules returned per joule spent on industrialized #agriculture, #CC-BY, Energies 2009, 2(1), 1-24; https://doi.org/10.3390/en20100001
on 02022-05-21“George Jetson” gets the #EROEI of industrial agriculture badly wrong: he quotes Pimentel as saying the EROEI of industrialized agriculture is about 0.25:1, but what Pimentel actually found was 1:0.25, four joules returned per joule spent. Consequently Jetson’s entire point about “The EROI of global food production” is wrong. #food #energy #agriculture
on 02022-05-21how much #ammonia does #agriculture need per bushel of #corn? 3kg of hydrogen makes 17k of ammonia which makes 250 bushels of corn (56 lb. each, so 6350 kg; 3.5 kcal/g gives 370 MJ/bushel, so that’s 93 GJ), so the 142MJ in 1 kg of hydrogen has about 3% of the energy content of the resulting 31 GJ of corn. #fertilizer #economics #energy #food
on 02022-05-21#Video on “glasshouse vegetable production in the #Netherlands” #greenhouse #agriculture #vertical-farming
on 02021-01-20#agriculture with human waste: “peeponics”
on 02017-04-28#Australia has such high vegetable prices that it’s likely profitable to build Sundrop Farm, a US$200M plant using #solar #desalination of seawater for desert #agriculture
on 02016-10-07#slow-motion #video of #agriculture weeding #robots running #ROS.
on 02015-11-22#Robots can kill weeds plaguing #agriculture without using #herbicides, using #computer-vision.
on 02015-11-22