สืบค้นงานวิจัย
Available Boron Status and Its Relationships with Physico-Chemical Properties of Soils under Rubber Cultivation in North-East India
M. Choudhury - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Available Boron Status and Its Relationships with Physico-Chemical Properties of Soils under Rubber Cultivation in North-East India
ผู้แต่ง / หัวหน้าโครงการ (EN): M. Choudhury
บทคัดย่อ (EN): Rubber (Hevea brasiliensis) is fast attaining the most important status as a commercial plantation crop in the north-east India where and it occupies an area of about one hundred thousand hectares at present. The yield level in the region is, however, considerably below the national average. Besides the limiting agro-climatic factors, inadequate and imbalanced nutrition seems to be one of the major factors for such low yield. Boron, an essential micronutrient for all vascular plants, plays an important role in pollination and fruit setting. The supply of soil B to plants largely depends upon the physico-chemical properties of soils and it is therefore desirable to study its relationship with soil characteristics. However, no information on Boron status in the rubber growing soils of the region is available. The present study was, therefore, undertaken to determine the B status and its relationship with various physico-chemical characteristics of soils under rubber plantations in the region. Thirty surface (0-30cm) soil samples each from rubber plantations of Lower Brahmaputra valley, hill zones and Barak Valley of the state of Assam, North Tripura, South Tripura and West Tripura districts of state of Tripura and Garo Hills of Meghalaya were collected. Different physico-chemical properties and hot water soluble Boron were estimated using standard methodologies. Prescribed critical limit was used to find out the percentage of soil samples as deficient and sufficient in HWS-B. Correlation coefficients of HWS-B with different physico-chemical properties were worked out. Step down regression analysis was carried out to find out the factors affecting the variability of HWS-B in soil. Results showed that the HWS-B content in the rubber growing soils of north-east India varied from 0.22 to 1.24 mg kg-1 with an average value of 0.73 mg kg-1. The highest mean HWS-B content was observed in the Barak Valley of Assam (0.79 mg kg-1) and the lowest in the Garo hills of Meghalaya (0.64 mg kg-1 as B deficiency, various rubber growing regions of the north-east was in the order as follows: South Tripura Z47.38%)> Garo Hills of Meghalaya (42.76%)> West Tripura (41.89)> Lower Brahmaputra Valley of Assam (41.52%)> Hill Zone of Assam (39.18%)> Barak Valley of Assam (36.74%). On an average, about 42 per cent samples was found to be deficient in HWS-B. Heavy rainfall, undulating land surface with steep slopes, inadequate ground cover etc. are the major factors contributing to the severe leaching of Boron which in turn resulted in its deficiency at such high magnitude. It was significantly and positively correlated with clay (r=0.305**) and organic carbon (r=0.392**) of the soil. It did not show any significant relationship with sand, silt, pH and CEC of the soil. Moreover, stepwise regression analysis revealed that organic carbon and clay together contributed 21.3 per cent variability of HWS-B in the rubber growing soils of north-east India. Addition of other factors considered in this study did not bring any noticeable changes in the variability of HWS-B. The findings warrant adequate attention to the judicious application of B to overcome its deficiency and its maintenance through addition of sufficient amount of organic matter with adequate ground cover in the rubber plantations of the north-east.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): rubber growing
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

การอ้างอิง

M. Choudhury. "Available Boron Status and Its Relationships with Physico-Chemical Properties of Soils under Rubber Cultivation in North-East India". ไม่ระบุหน่วยงาน. ม.ป.ป.

M. Choudhury. "Available Boron Status and Its Relationships with Physico-Chemical Properties of Soils under Rubber Cultivation in North-East India". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Available Boron Status and Its Relationships with Physico-Chemical Properties of Soils under Rubber Cultivation in North-East India
M. Choudhury
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
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