The Effect Of Straw Mulching And Tillage On Soil Water Heating Conditions And Soybean Products

As one of the most ancient crops in the world,soybean has always been popular amo ng Chinese people because of its rich nutritional value and wide use.But of soybean produ ction in China is not self-sufficient,as the largest net importer of soybean,the existing ag ricultural technology in China already can't satisfy our growing demand for quality and qu antity of soybean,and heilongjiang in China's largest "granary",the agricultural production of soybean is especially important.Straw is a common organic fertilizer in our country,its contains rich NPK,and other nutrients,and are widely distributed and has a long history and straw yield up to 900 mi llion tons per year in China,but there are quite a number of straw has not been very goo d use,a large number of straw by open burning and waste,its brings the problems such a s environmental pollution and farmland security has become increasingly serious.The traditi onal farming methods due to the frequent for soil disturbance,not only can make the soil,the already scarce nutrients more easily lost,also can bring the soil harden and other seri ous problems such as the destruction of the environment.This test by Harbin shifting patterns of typical "corn and soybeans" as the research o bject,and set five different kinds of straw returned + farming fields: conventional tillage(TT),no-till straw returned(NT),no-till seeding + corrugation depth pine(NTS)in seedlin g stage,ridge deep loosening stubble machine + seedling ditch deep loosening(SCS),digg ing in seedling stage + corrugation depth(DS),comparing the treatment on soil temperatur e,soil moisture,soil hardness and the effects of soybean production,to explore the straw returned and farming methods on soil hydrothermal condition and the influence of soybean production,the results showed that:Early sowing the processing size of soil temperature: DS > SCS > TT > NT = NTS,treatment DS than TT raised during may to June soybean soil temperature,high temperatur e period in July when the processing of size: TT > NTS > SCS > NT > DS,DS compar ed to other processing significantly improves the soybean soil accumulated temperature(p < 0.05),on July 22,when compared to the treatment of TT soil DS increased 20.51 ? a ccumulated temperature,processing,processing NT,SCS,NTS were lower 11.59 ?,22.24 ? and 24.72 ?.Treatment of DS in the early stage of soybean growth,improved soil da ily extreme temperature.Between the end of may and August,the treatment of NT and NT S will also delay the occurrence of the minimum temperature of the soil,and deal with th e time of the daily maximum temperature of the soil.In the process of precipitation,the te mperature of NT is the lowest,the temperature is the most,the soil has a certain heat pre servation capacity,and the soil temperature fluctuates greatly during the rainfall.In the soybean growth period before June,NTS treatment significantly increased soil water content(p<0.05),while DS treatment significantly reduced soil water content,and th ere was no significant difference between the treatments in the temperature period of July(p<0.05).Before sowing seed in the maximum water content between the groups from big t o small in turn is: TT > NT > > DS SCS > NTS,the processing of NT,DS,SCS,NTS below TT processing respectively 3.61%,4.45%,4.51,4.61,with the increase of temperatu re,water content between treatment NTS to become the largest processing,daily minimum water content change trend and the maximum water content have the same change trend,the treatment in early than TT,will delay the emergence of the highest water content and the presence of the minimum water content of time ahead of time.NTS has been in high water content during rainfall.Soil hardness differences between the groups 0 to 30 cm soil layer,the main treatmen t of NT and NTS in the early stage of the soybean growth,compared with TT,late will make soil hardness increases,and had no significant effect(p < 0.05),processing SCS in early will make soil hardness increases,but the effect is better than dealing with NT and NTS,deal with DS in the whole family will reduce the ridge and the ridge machine for s oil hardness,processing NTS will lower ditch 0 to 30 cm soil hardness,soil ditch the rest of the situation and help the ridge platform,ridge line.Differences between the treatment effect on yield of soybean,treatment DS than TT w ere 24.48 kg/mu,increase production rate was 11.01%,the difference was not significant(p < 0.05),treatment DS above minimum NTS per mu,40.61 kg/mu,the production rate was 19.69%,and the differences reached significant level(p < 0.05),and the rest had no significant difference between the groups(p < 0.05).