At the same time,United Nations FoodandAgriculturalOrganization demarkedthefarming system into threetypes:1.naturalfallowfarmingsystem2.glasslandfarmingsystem,3.permannetfarming system.Thenaturalfarmingsystemisincludefallow farming system and shiftingfarmingsystem
6 At the same time, United Nations Food and Agricultural Organization demarked the farming system into three types: 1.natural fallow farming system, 2. glassland farming system, 3.permannet farming system. The natural farming system is include fallow farming system and shifting farming system
FirstShiftingfarmingThe main speciality of the shiftingfarmingisslashandburnandalternational rest system.Only waytoresume soil fertilityis depending thenature,therefore,thesystem hasthegreat damaging to the natural vegetationThe shifting time isabout 20-30yearsand the durable yearsisabout 3-8 years.Theshiftingtimeisvery long!!!
7 First Shifting farming The main speciality of the shifting farming is slash and burn and alternational rest system. Only way to resume soil fertility is depending the nature, therefore, the system has the great damaging to the natural vegetation. The shifting time is about 20-30 years and the durable years is about 3-8 years. The shifting time is very long!!!
Nowadays, there are still 2hundredmillionpeople intheworld using the shifting farmingthey mainly distributed in Africa,SorthAmerica,SorthAsia,FarEastof RussiaandtheremoteareaofSouthChina
8 Nowadays, there are still 2 hundred million people in the world using the shifting farming, they mainly distributed in Africa, Sorth America, Sorth Asia, Far East of Russia and the remote area of South China
Second FallowfarmingWiththefast developmentof humansocietyandtherapidgrowthofpopulationhuman being need more usingratio forthesoil. Then, they found that if plough soiland burying vegetableinto soil,the yieldwould raise.Then the fallow time wouldcompressedinto 1-2years.This is thebeginning of artificial curing soil
9 Second Fallow farming With the fast development of human society and the rapid growth of population, human being need more using ratio for the soil. Then, they found that if plough soil and burying vegetable into soil, the yield would raise. Then the fallow time would compressed into 1-2 years. This is the beginning of artificial curing soil
The fallow farming in China wasbegunat Spring andAutumnPeriod.The time whenthe systemwas began popular in occident ismiddle century, but the soil usingratio of the system is low,thecuring soil effect is small and theyield is not high.10
10 The fallow farming in China was begun at Spring and Autumn Period. The time when the system was began popular in occident is middle century, but the soil using ratio of the system is low, the curing soil effect is small and the yield is not high