【Objective】The evaluation index system of maize varieties suitable for mechanical grain harvest in Inner Mongolia was established to provide the basis for the evaluation,selection and timely harvest of maize varieties suitable for mechanical grain harvest in Inner Mongolia,and to point out the direction for variety breeding.【Methods】The representative varieties of six maturity groups from extremely early maturity to late maturity were used as experimental materials to study the mechanical grain harvest traits simultaneously in six ecological regions of Inner Mongolia,at the physiological maturity,10,20 and 30 d after physiological maturity,the grain breakage rate,grain fragmentation rate,impurity rate,grain moisture content and plant lodging rate were measured;The varieties with suitable ecological regions conditions and excellent mechanical grain harvest traits were selected for the identification and selection of evaluation index of varieties suitable for mechanical grain harvest.【Results】Grain breakage rate,grain fragmentation rate and impurity rate have an extremely significant positive correlation with grain moisture content（P<0.01）. The grain moisture content at harvest stage has an extremely significant negative correlation with the time and accumulated temperature from emergence to harvest,from silking to harvest,and from maturity to harvest（P<0.01）,and the correlation increased in turn.The grain dehydration rate has an extremely significant positive correlation with the basic moisture content and daily average temperature（P<0.01）. The regression equation of grain dehydration rate （y） with basic moisture content （x₁） and daily average temperature （x₂） was y=-0.523 318+0.022 732x₁+0.025 422x₂,R²=0.419 2,P<0.01. The total yield loss rate and ear drop rate have an extremely significant positive correlation with lodging rate of plants at harvest stage（P<0.01）,but grain drop rate was not significantly correlated with lodging rate of plants at harvest stage（P>0.05）. There was no significant correlation between plant lodging rate and plant height,ear height,ratio of ear height to plant height,stem diameter,ratio of stem diameter to plant height（P>0.05）. The primary and secondary index for the evaluation of maize varieties suitable for mechanical grain harvest were established,covering 3 levels and 55 index.【Conclusion】The evaluation index system of maize varieties suitable for mechanical grain harvest in Inner Mongolia was established.It takes into account the commonness and regional individuality of each ecological region,and the index is quantified and easy to operate. The provision of the “grain fragmentation rate” index points out the invisible loss in the process of mazie mechanical grain harvest,which makes the evaluation of yield loss more comprehensive.

【Objective】Screening shade-tolerant soybean varieties（lines） suitable for maize-soybean intercropping planting mode in northern Jiangsu,and constructing an accurate and reasonable soybean shade tolerance evaluation system.【Methods】The natural shade environment created by maize-soybean intercropping in northern Jiangsu was used as the treatment,and the clear seed was used as the control. 12 agronomic traits such as plant height,pod height,and branch number of 24 soybean varieties（lines） were measured at maturity stage. Principal component analysis,membership function method,and multiple linear stepwise regression analysis were used to construct shade tolerance coefficients and evaluate the comprehensive shade tolerance of each soybean variety（lines） under intercropping mode.【Results】Index of shade tolerance coefficient of 12 agronomic traits were transformed into 4 independent comprehensive indexes,representing 74.771% of the original data information. The results of comprehensive shade tolerance evaluation value（D） and cluster analysis showed that 24 soybean varieties（lines） could be divided into 3 categories according to their adaptability under shade stress,including strong shade-tolerant（six varieties/lines）,moderate shade-tolerant（nine varieties/lines）and weak shade-tolerant（nine varieties/lines）. The regression equation of shade tolerance was constructed by multiple linear stepwise regression analysis：D=-1.158+0.062X₂+0.249X₅+0.201X₇+1.002X₁₀+0.665X₁₁（R²=0.972 2）,and the fitting accuracy was more than 89.14%. Five shade tolerance identification indexes of pod height,pod number per plant,seed number per plant,100-seed weight and yield were selected.【Conclusion】According to the shade tolerance ability,the 24 soybean varieties（lines） were divided into three categories：strong shade-tolerant,moderate shade-tolerant and weak shade tolerant. Under the maize-soybean intercropping model in northern Jiangsu,five traits,including pod height,number of pods per plant,number of grains per plant,100 grain weight,and yield,can be selected for comprehensive evaluation of soybean shade tolerance. Under the maize-soybean intercropping mode in northern Jiangsu,five traits,including pod height,pod number per plant,seed number per plant,100 seed weight,and yield,could be selected to comprehensively evaluate the shade tolerance ability of soybean.

【Objective】To explore the effects of different microbial agents on potato growth and development and soil nutrients in potato fields,so as to provide a reference for green and sustainable potato planting in Inner Mongolia.【Methods】Potato V7 was used as the test material,by setting distilled water（CK）,applying Bacillus sp. 188 bacterial agent（T1）,Pseudomonas sp. BP16 bacterial agent（T2）,and Streptomyces rochei D74 bacterial agent（T3） four treatments to soak the seeds for 30 min. Potato yield,tuber starch content,dry matter mass of each organ,nutrient accumulation per plant,leaf chlorophyll content,nitrate reductase activity,soil ammonium nitrogen,nitrate nitrogen,available phosphorus and available potassium content were measured at different growth stages after potato planting.【Results】After 110 days of potato planting,compared with CK,the yield of potato in T2 and T3 treatments was significantly increased by 7.14% and 9.16%（P<0.05）,the starch content of tubers was significantly increased by 11.84% and 16.38%（P<0.05）,the dry matter mass of potato roots,stems,leaves,and tubers were significantly increased by 26.87%,16.92%,11.77% and 13.59% by T3 treatment（P<0.05）,the accumulation of nitrogen,phosphorus and potassium in plants was significantly increased by 28.86%,32.78% and 30.81% by T3 treatment（P<0.05）. After 70 days of potato planting,the chlorophyll content in potato leaves treated with T3 treatment was the highest [4.29 mg/（g·FW）],and the nitrate reductase activity in the leaves was significantly increased by 15.29% compared to CK（P<0.05）. After 50 days of potato planting,the soil nitrate nitrogen content in T3 treatment reached its maximum value（42.32 mg/kg）,the available phosphorus content significantly increased by 26.17% compared to CK（P<0.05）,and the available potassium content in T1 and T3 treatments significantly increased by 24.95% and 21.65% compared to CK（P<0.05）,respectively.After 70 days of planting,the soil ammonium nitrogen content in T2 treatment significantly increased by 47.03% compared to CK（P<0.05）.【Conclusion】Soaking seeds with Streptomyces rochei D74 microbial can increase potato yield,tuber starch content,dry matter mass of each organ,plant nitrogen,phosphorus and potassium accumulation,at agent tuber formation stage,the leaf chlorophyll content at maturation stage,soil nitrate nitrogen,available potassium,available potassium content at early growth stage,soil ammonium nitrogen at agent tuber formation stage. It can be used as a suitable microbial agent for potato cultivation in Inner Mongolia Autonomous Region.