Biogas and Plant Production
-
Upload
draga-jovanovic -
Category
Documents
-
view
220 -
download
0
Transcript of Biogas and Plant Production
-
7/24/2019 Biogas and Plant Production
1/2
How that powerplant idea developed. First, main issue in organic farming nitrogen.
Large precentage of it comes from the air, xed by legume bacteria. So every ve-
six they grove clover grass. arlier it was a habit tu cut clover !-" times a year and
leave it on the eld. #ut that wrong step-next generation of clover grow bad and
also nitrogen is wasted by evaporation. $welve years ago they got idea of processing
clover grass into heat and electricity, and as a residue they have biogas slury as avery valuable fertili%er which they wouldn&t have otherwise. 'nd it&s a good circle-
thrown into the box, move up by elevator to digester with temperature inside of
"()*, and it+s full of methanogenic bacteria, i.e. bacteria that produce methane out
of organic matter. $he biogas contains ( of mathane afterwards stored in rubber
tent and the engine burns the biogas lie a diesel engine, produces energy with a
generator and produces lie nusproduct heat that can be used to heat the ob/ects on
the farm and also to dry grains in summer time when they harvest it.( Material-
clover and grass cut and putted into the silo). $he second component they put
is a menure and every day is taen and putted into digestor so there are no big piles
throghout the farm. First 0-! years they relayd only of these two components but
they reali%ed it+s not easy to digest it-bery, pumping it di1cult, nitrogen transforms
into amonia which poisenous for bacteria. so aditionally they are using corn silage-
the risult very good, great improvement in digesting process so nowadays they put
abot ( of it into digestor every day. 0 ha of corn on their own farm (silo).$hat+s
good because otherwise they should buy corn silage, even non organic allowed to
certain grade, but that permitted percentage gets lower by the regulations every
year. *arbo-hidrates 2corn34#acteria don+t lie variation in feed- they prefer same
ingredients, same $, same movement-so every cut get silaged, cut it young because
digestability than higher abou !(-" ha of clover and grass enough to run the whole
year, electric power 5( 6, small biogas plant. #ecause in 7ermany can be nd of
( or even 896, but they run with corn silage mainly.conomically, they try to produce more grain but if they notice higher infection with
hisle or ducweed they leave it for 0 years, the more you cut it better ght against
weeds. #ut grain-sell, feed pigs. *lover grass silage-80 t, manure !-" t
manure, 0 t of corn silage
8 of electricity used on the farm, rest sold to public energy system, to the grid.
$he maintenance payed by sold energy. *ontrators for energy, pipe building were
present at the beginning but they helped them in construction. :owaydays 5
percent in feed corn-en%imes;chop grass very small. First cut (-8-th of 9ay, on
some of elds envieromental programme, payed to cut later, but that is abot ( ha
and other without care of birdsLittle bit more of half-human consumption. $riticale, beans, peas-pig. $otal 8
-
7/24/2019 Biogas and Plant Production
2/2
nitrogen-not on hot, sunny day, special machines tubes, and put rain water to mae
it more li=uid more available to plants
6heat ld-one wee ago seeded, before that clover and grass. #ecause wheat and
spelt have high demands for nitrogen that+s why planted after clover. where the
wheat is not still germinated to the surface, it is beove the ground against the weeds
used comb harrow-blind howing.Spelt eld-$hree days ago, with spelt not nude. $hey plow the remainings of clover,
than prepare seed bed with rotating harrow for the grains. So move remainings to
prevent it growing further.
$hree di>erent types of old species-spelt $.spelta , emmer $.dicoccum, einorn $.
monococcum-the oldest type of these curious, he thins is not high yield but some
baers lie to put it in the bread and pay high price. :aturland sells to baery they
mill it byself. Spelt in higher ammounts. mmer at rst used summer, full of wheat-
they multiply it now on the farm. inorn seed in northern 7ermany bought.
:ot problem of lodging, and eiorn even more and thay tae care of amount of
nitrogen.
Soil compaction usually big issue on the elds-small as possible tractors with wide
tyres for placing the pressure, for easy wors, but can+t be avoid there is slury tan
8 cubic meter, combines for harvest,choppers for grass and clover-very heavy. Soils
vunerable to compaction-wet in under soil, loamy and must tae care. $he clay
increases with the depth. *ertain share of silt, less silt here. From the olders ice ages
so share of lime lower. *a bridges mae fractions stabile-bring lime. ?oc fosfate "-(
" g per ha lie fertili%er, compensation fertili%ation for what is taen. @hosphorus
in pelates, desolves in ground.
@ests-beans aphids, not problem, fungi rust sometimes, crop rotation prevents and
also crop density is not high, air movement, higher varieties away from soil
:o cover crops, because winter grains. An summer legumes, oat, part of triticalesummer. 'void so much in winter, but eg $riticum in winter more yield. *over crops
before summer crops-in past years legumes, then had problems with fungi so had
problems in beans with root fungi because they related. *over c facelia, niger seeds,
grasses, raddish, sunBower, bucwheat.0(-! max legumes, even if they needed,
and from slury enough :.
?otationC *lover and grass-wheat or spelt-triticale, ruy or oat, not hungry Dbeans or
peas, after 0-! years-one year of triticale or ruy. So in (-5 years again clover.