Study on Potassium Status of Chief Cultivated Soils in Jilin Province
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The chemical method of potassium states in main cultivated soils in Jilin province showed that potassium supplying potentiality of this three soils were bigger than that of southern soil.The contents of total K in above mentioned three soils all were bigger.The contents of slowly availability potassium were plentiful,the contents of rapidly availability potassium were higher in black soil and Thernozem,but it were lower in Albic.Potassium level of three soils was decided by the kind and amount of K-bearing minerals in soils.Cite
The pH and content of available N,available P,available K and trace elements of different soil samples from the western regions were determined by acidimeter,flame photometry and atomic absorption spectrophotometer,and the effect of planting oat on content of inorganic elements and trace elements in soil was studied to know the soil composition and nutrient content in western region of Jilin province.The results showed that the distribution of available N,P and K was not uniform in alkaline soils,the content of trace elements had no obvious difference and the pH of some soil samples was up to 9.6.Planting oat in alkaline soils was beneficial to soil acidulation,which indicated that planting oat in alkaline soils can provide a certain help for improvement of alkaline soils in western regions of Jilin province.
Alkali soil
Soil test
Soil nutrients
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Coastal soils of Guntur district in Andhra Pradesh are developed from marine sediments. Nutrient status was evaluated for four soil profiles of a coastal village to have information on the nutrient supplying capacity of these soils which is necessary for making accurate fertilizer recommendation in the study area. The nutrient status of the soils indicated that they were low in organic carbon (0.007 to 0.058 g kg -1 ), available nitrogen (28 to 247 kg ha -1 ), medium to high in available phosphorus (6.60 to 90.10 kg ha -1 ) and high in available potassium (241 to 2016 kg ha -1 ) while concentration of total nitrogen, phosphorus and potassium varied from 100 to 560, 37 to 325 and 625 to 7500 ppm, respectively. Similar trend in sub-surface distribution of organic carbon and total nitrogen revealed the soils were old alluvial soils except profile 2. Sufficiency in available micronutrient content existed except for zinc. Distribution of total micronutrient within the profile showed lower values on surface than subsurface layers indicating fluvial nature of deposition. Relationship of nutrients with organic carbon and clay content were positive while the acidity of the soils resulted in negative affect on micronutrients except copper. Contribution of parent material was significant in case of total potassium.
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The changes of soil nutrition status in Zhejiang province were studied through the investigation of field capacity of four different type soils(blue clayey paddy soil,silt-clayey yellow mottled paddy soil on fluvimarine deposit, paddy field on redeposit of red soil and diluvial gritty loamy paddy soil) in 2008,combined with the soil nutrition census data acquired from the Second National Soil Survey.The results showed that soil pH decreased obviously,which was in need of adjustment.The level of soil organic matter was higher without significant changes.The content of available-P markedly increased,and there were great differences among different soil types.The content of available-K increased significantly as well,but the K-deficiency was still very common in farmlands.
Silt
Soil nutrients
Soil survey
Soil test
Paddy field
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The contents of potassium in 2116 soil samples collected from tobacco growing areas in Henan Province were analyzed. The results showed that the average contents of rapidly available K and total K were 188.88 mg/kg and 2.28% respectively. The tobacco growing areas in order of contents of rapidly available K were west Henaneast Henansouthwest Henansouth Henanmiddle Henan and in order of total K were east Henanwest Henanmiddle Henansouth Henansouthwest Henan. The major types of tobacco soil in order of contents of rapidly available K were red clayfluvo\|aquic soilcinnamon soilsajong black soilyellow cinnamon soilyellow brown earth and in order of total K were yellow brown earthred clayfluvo\|aquic soilcinnamon soilyellow cinnamon soil sajong black soil. The suitable fertilization method was recommended based on the characteristics of potassium content and distribution of soil in Henan tobacco growing areas.
Red soil
Soil test
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In order to make clear the soil fertility status of cultivated land in Zhengding County,the contents of organic matter,total nitrogen,available phosphorous,available potassium,and trace elements in soil from 2 000 representative samples were determined and analyzed.The results showed that the average contents of organic matter,total nitrogen,available phosphorus and available potassium were 16.0 g/kg,0.92 g/kg,20.56 mg/kg,and 107 mg/kg,respectively,which increased by 29.0%,19.6%,94.0% and 13.3% than that in the 2nd national soil survey which was carried out in the 1980s.The contents of organic matter,total nitrogen and available phosphorus were at medium to high levels,and the available potassium content of 48.5% cultivated land was at sufficient level.But there were great difference in soil nutrient contents under different planting system.The contents of organic matter,total nitrogen,available phosphorus and available potassium in vegetable fields were at medium to high levels.The contents of organic matter and available phosphorus in wheat/maize rotation fields were at medium level,while those of total nitrogen and available potassium were at medium to low levels.And to sandy soil,all the soil nutrients contents were at low levels.The contents of soil available Fe,Mn and Cu were at rich level,but 4.9% field was lack of Zn,and 31.8% field was lack of B.According to the soil fertility status,the countermeasures for field nutrients management were suggested for Zhengding County.
Soil test
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272 of soil samples were collected from tobacco planting areas in Enshi.Soil pH,organic matter and macroelements were determined.The results indicated that about 90% of the soil pH was suitable for tobacco growth.In term of soil samples,50%,60% and 77.65% of soil organic matter,total N and available phosphorus content were suitable for tobacco growth.35% and 60% of the soil s were found with relatively higher levels of the soil organic matter and available N.Nearly 23% of the soils available phosphorus content were extremely poorer.More than 60% of the soils available potassium content was deficient and quite diversity among different the regions.The contents of organic matter,available N,available phosphorus and available potassium increased with the elevation increased.Exchangeable magnesium contents was in general deficient and 72.6% of the soils were less than 0.4 cmol/kg.About 30.51% of the soils water-soluble B was deficient and 30.51% soils water-soluble B was deficiency.Soil available Zn contents of most soil samples was appropriate,but there have big difference in different sampling points.
Soil test
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Chemical properties of red soils in 6 places in the forestry of Hunan China were studied. The result indicates,the soils were of strong acidity with pH 4. 11 - 4. 96; differences in the organic content were obvious,ranging between 9. 50-37. 6 g/kg;the contents of total nitrogen were not high,0. 321 - 1. 70 g/kgfthe content of total phosphorus were 0. 126 - 0. 441 g/kg;the contents of total potassium were relatively high,up to 10. 5 - 18. 1 g/kgjthe content of exchangeability cation were widely different,ranging from 3. 86 - 50. 6 mmol/kg;Exchangeability cation CEC number value were up to 13. 9 - 34. 0 cmol/kg. The survey data of Cu,Zn,Pb and Cd indicate,the soils have not been polluted by heavy metals. In view of such conditions as the soil chemical property .vegetation and geographical position of the ground, etc. synthetically, corresponding development suggestions were put forward.
Cation-exchange capacity
Soil survey
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This article studied the content,distribution and influence factor of selenium in soils by analyzing 149 soil samples from main livestock feeding bases including Weishan,Eryuan,Lijiang,Yongsheng,Yuanjiang,Tonghai,Luliang,Yiliang and Zhaotong counties in Yunnan provice.The results showed that there is a big variance on selenium content of soils.The range is from 0.073 2 to 0.638 mg/kg.The mean was 0.256 mg/kg.Most selenium content in the soils are at sufficient level.The selenium contents in soils from Paleozoic Basalt and Red Earth Area of Carbonzte have the highest value.The selenium contents in soils from multi-Yellow-Red Earth,Purple Earth Clastic Yellow-Red earth and metamorphite red soil are lower than average value in China.Soils parent material affects the content and distribution of selenium.Selenium contents in soils from dolomite,basalt and limestone are higher than chinese average value.However,selenium contents in soils from sandstone are lower than Chinese average value.In addition,there are correlation between the pH,OM,CEC and the contents of iron,manganese,cobalt,iodine,copper,sodium and zinc in soil.
Red soil
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This paper shows that the average content of total sulfur in the main cultivited soils was 511.9 mg·kg-1 and the range was 102-1334 mg·kg-1.The highest was in meadow soil and the lowest was in wind-sand soil.The average content of available sulfur was 26.3 mg·kg-1.The highest one was in lessive soil and the lowest one was in wind-sand soil.Wind-sand soil and soline-alkali soil were the two main sulfur deficiency soils.According to the soil forming material,soils developed from sand material were 100% S deficiency,while soils developed from river allurium and lacustrine were 60% S deficiency.The crop yield was increased more than 7.0% when applying sulfur fertilizer.
Alkali soil
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Soils of Saurashtra Region are comprised of 10 Soil Groups and Majority of Soils are Medium Black Calcareous in nature. One hundred sixty nine surface soil samples were collected (0-15 cm) at an interval of 10 years and different fractions of Zn were determined. The WS,EF and AF of Zn showed an increasing trend after a span of 10 years, while RF decreased . During 1990, predominant components were DTPA available form. The total Zn content in Soils of saurashtra region increased, while residual forms of zn decreased marginally. The per cent available and total available Zn also increased after 10 years.
Saurashtra
Calcareous soils
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