สืบค้นงานวิจัย
Nutrient Status of Soils and Leaves of Immature Rubber in the East Coast of Upper Part of Southern Thailand
Saichai Suchartgul - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Nutrient Status of Soils and Leaves of Immature Rubber in the East Coast of Upper Part of Southern Thailand
ผู้แต่ง / หัวหน้าโครงการ (EN): Saichai Suchartgul
บทคัดย่อ (EN): Major rubber plantation in Thailand is in the southern part of the country, in which soils are highly weathered and acid. Most of the plantations are replanted both from rubber and other crops repeatedly for more than 40 years. Therefore, soil fertility is declined. This study was carried out to examine nutrient status of rubber growing-soils and rubber leaves. Forty three samples of soils and leaves were collected from 4 year-old rubber plantations during June to July 2009 in the east coast of upper part of southern Thailand. The samples then were analyzed following standard procedures. The nutrient status was done by comparing nutrients with the diagnostic criteria. From the criterion of rubber soils, the results showed that CEC and exchangeable K were low in every samples (0.7 to 5.3 cmol(+)/kg) and 18 to 113 mg/kg, respectively). Most of the soils had medium organic matter and exchangeable Ca (0.6 to 2.3 % and 18 to 576 mg/kg, respectively) , but low in available p and exchangeable Mg (0.3 to 28.0 mg/kg and 3 to 144 mg/kg, respectively). When comparing with the criterion of general soils, the results showed that CEC, OM, exchangeable K, Ca, Mg were low, and extractable Cu and B were low (0.03 to 1.48 mg/kg and 0.14 to 0.61 mg/kg, respectively). Extractable Zn was low to medium (0.14 to 1.40 mg/kg). Extractable Mn was medium to high in almost samples (0.5 to 110.2 mg/kg), and all of them had high available S and extractable Fe (17 to 38 mg/kg and 13.5 to 97.5 mg/kg, respectively). The results of leaf analysis showed that most of the samples had low N and K (2.20 to 3.51 % and 0.72 to 1.46 %, respectively). P and S were in a wide range of low to high (0.16 to 0.29 % and 0.11 to 0.37 %, respectively). Mg was high to very high (0.18 to 0.40 %). Fe and Cu were medium to high in almost samples (64 to 151 mg/kg and 8 to 14 mg/kg, respectively). And most of them had high Ca, Zn and B (0.56 to 1.94 %, 19 to 61 mg/kg and 11 o 85 mg/kg, respectively). Mn was very high to toxic in almost samples (142 to 574 mg/kg). It could be concluded that the present status of soils in immature rubber was generally acidic, low in CEC, available P, exchangeable K, Cu and B, low to medium in OM, exchangeable Ca, exchangeable Mg and Zn, medium to high in Mn, and high in available S and Fe. The nutrient status of leaves was low in N and K, medium to high in Fe, low to high in P, S and Cu, medium to very high in Mg, high in Ca, Zn and B, and high to toxic in Mn.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): organic matter
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
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Saichai Suchartgul. "Nutrient Status of Soils and Leaves of Immature Rubber in the East Coast of Upper Part of Southern Thailand". ไม่ระบุหน่วยงาน. ม.ป.ป.

Saichai Suchartgul. "Nutrient Status of Soils and Leaves of Immature Rubber in the East Coast of Upper Part of Southern Thailand". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Nutrient Status of Soils and Leaves of Immature Rubber in the East Coast of Upper Part of Southern Thailand
Saichai Suchartgul
การยางแห่งประเทศไทย
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