สืบค้นงานวิจัย
Distribution of Potassium Forms in Soils under Repeated Rubber Cultivation and Virgin Forest
A. Ulaganathan - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Distribution of Potassium Forms in Soils under Repeated Rubber Cultivation and Virgin Forest
ผู้แต่ง / หัวหน้าโครงการ (EN): A. Ulaganathan
บทคัดย่อ (EN): Among the major nutrients. Uptake of potassium is considered to be next to that of nitrogen for most crops which leads to its removal in substantial quantities though economic produce and biomass. Successive cultivation of the same crop has been reported to deplete soil potassium and change the distribution of K forms. This will have profound influence on the K availability to crops and should be taken in to consideration for potassium management. Particularly in the subsequent cycles of cropping. Major rubber growing soils are under Ultisols and in general. Ultisols are highly weathered with relatively low exchangeable bases. The total potassium of rubber growing soils of Kerala ranged 0.48-1.22 percent and that of ASSAM 1.33 per cent. NBSS and LUP surveyed rubber growing soils in the traditional region and reported that 62 percent is low in available K. In soil. K exists as solution. Exchangeable and non exchangeable forms and they are in dynamic equilibrium with each other. Application of fertilizers increases solution and exchangeable K are depleted from soil then the non exchangeable K slowly becomes exchangeable form. Natural rubber cultivation started in India about a century ago. Most of the rubber plantations in traditional rubber growing tract are in the 3rd cycle. The removal of potassium through economic produce is limited. but at the time of felling of trees at the end of a planation cycle.substantial quantities are removed through biomass. The objectives of the present study were to determine the offect of repeated cultivation of rubber on the K content of soil and to compare the distribution of different forms of K in soils under repeated rubber cultivation and adjacent virgin forest. We also attempted to correlate forms of potassium with other soil propertees. The study site was located at 9o 312 E and 76o 592 N in the midland of traditional rubber growing tract at Mundakayam. Kerala. India. Eight soil samples (0-30 cm) each were collected from 2nd and 3rd cycle rubber plantations and from adjacent forest. The samples were air dried at room temperature and sieved through 2 mm sieve and subjected chemical analysis. The samples were andlysed for water soluble. Exchangeable. And non-exchangeable. Clay potassium and total potassium. The water soluble potassium was estimated by shaking the soil with distilled water for 24 hours. Exchangeable K was determined by extraction with 1M ammonium acetate. Non exchangeable K was extracted by 1M HNO3 digestion at 113 oC for 25 minutes. Total K and Clay potassium were estimated by X – Ray Fluorescence spectroscopy. Mineral K was calculated by subtracting non exchangeable from tatal K. To estimate total and clay potassium by XRF. 0.7000 g of finely ground soil and 7.000 g of flux (mixture of 35.3% lithium-borate and 64.7% lithium-meta borate) were taken in a plastic vial. The vials were rotated by hand to get the proper mixing and homogeneity. The samples wer fused at 1050oC in platinum crucibles in a pre heated muffle furnace for about 40 minutes and then poured the molted liquids into platinum molts to get glass discs. After cooling, these discs were used for total elemental analysis using wave length dispersive X-ray fluorescence spectroscopy. Clay samples were prepared in the similar manner after separation of clay from soil. Soil pH, OC, CEC, available phosphorus, Calcium and Magnesium were estimated by standard methods. Soil organic carbon. CEC and pH showed a declining trend due to rubber cultivation, however, there was no significant. The water soluble K ranged from 4.10 ppm in 3rd cycle rubber to 5.70 ppm in forest and there was no significant difference between treatments. Exchangeable K ranged from 55.9 ppm in third cycle rubber to 69 ppm in forest and they were comparable. Exchangeable K status gives an indication of the possible frop response to K application and hence is important for K management. The non exchangeable K (fixed K) was significantly lower (242.94 ppm) in 3rd cycle rubber. Mineral K was not significantly different in different systems. The total K ranged from 1.28 in 2nd cycle rubber to 0.96 percent in 3rd cycle rubber. The total K was 1.13 percent in forest. The data indicate the presence of considerable K reserve in the soil studied even in the third cycle. Replentshment of K through fertilizers might be the reason for the maintenance of water soluble and exchangeable K forms in rubber soils. Significant positive correlation was observed between water soluble K and soil pH, organic carbon status and CEC. Exchangeable K was positively correlated with CEC, Total K was also significantly correlated with non-exchangeable and mineral K. The study shows the presence of considerable K reserve in rubber plantations. The distribution of various K forms was comparable in different cycles of rubber cultivation and adjacent virgin forest.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): nutrients
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
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A. Ulaganathan. "Distribution of Potassium Forms in Soils under Repeated Rubber Cultivation and Virgin Forest". ไม่ระบุหน่วยงาน. ม.ป.ป.

A. Ulaganathan. "Distribution of Potassium Forms in Soils under Repeated Rubber Cultivation and Virgin Forest". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Distribution of Potassium Forms in Soils under Repeated Rubber Cultivation and Virgin Forest
A. Ulaganathan
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
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