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 ผลงานตีพิมพ์ในวารสารวิชาการSoil nutrient status after bamboo flowering and death in a seasonal tropical forest in western Thailandผู้แต่ง: Takahashi, M, Furusawa, H, Limtong, P, Sunanthapongsuk, V,  Dr.Dokrak Marod, Professor , Panuthai, S, วารสาร:  
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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Fertilizer Practices Affecting Soil Nutrient Status of Apple Orchards in Bhutan) ผู้เขียน:Tshering, ดร.อุณารุจ บุญประกอบ, รองศาสตราจารย์ , ดร.กุมุท สังขศิลา, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractApple (Malus domestica Borkh.) is one of the important fruit crops in Bhutan. However, little information is available on orchard nutrient status. This study aimed to evaluate the soil nutrient status resulting from different fertilizer practices in apple orchards. Three major apple growing districts (Thimphu, Paro and Haa) and three common fertilizer practices (organic, inorganic and mixed) were surveyed. In each district, 10 to 12 orchards were selected and six to seven trees per orchard randomly marked for soil nutrient evaluation. Soil samples were collected in December 2009 (during dormancy) from two depths (0–20 and 21–40 cm). Chemical analyses were carried out in the Soil and Plant Analytical Laboratory, Bhutan for pH, N, P, K, Ca, Mg, organic carbon and cation exchange capacity (CEC). Results showed that the apple orchards had low pH (5.65–5.85) in the inorganic fertilizing practice, low nitrogen (0.05–0.18%) in all fertilizer practices and moderate to high (17.7–86.75 mg kg-1) available phosphorous (P) in the inorganic fertilizing practice. The pH level was significantly different between fertilizer practices. No significant difference was observed for P and exchangeable Ca among districts, between fertilizer practices within a district and between soil depths within fertilizer practices. Significant differences were found between districts for N, organic C and CEC. In addition, the results showed significant differences in the nutrient status of N, P, K, Ca, Mg and CEC between the two soil depths; the surface soil (0–20 cm) always contained the higher amount. The results revealed that there was an insufficient level of N in all Bhutanese apple orchards, while the levels of available P and K were in the sufficient range. Fertilizer practices had insignificant results on soil nutrient contents. Orchards under inorganic fertilizer had a lower pH than the optimum range. The study also indicated that collecting soil samples from two depths is necessary to analyze the nutrient content in Bhutanese apple orchards. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Impact of Land Use on Soil Nutrient at Doi Pui and Tung Jaw, Chiangmai) ผู้เขียน:นายนิวัติ เรืองพานิช, ศาสตราจารย์ , Vanchai Viranant สื่อสิ่งพิมพ์:pdf AbstractThe change of land use practices from the hill evergreen forest to other land use types deteriorated the physical properties of soil. The bulk density of the top soil, 0 - 50 cm in depths was increased and soil porosity was decreased especially in the shifting cultivation and agroculture areas, but there was no difference at the depth of 50 - 100 cm in all types of land use. The amount of organic matter and sulfer in the soil was decreased in all types of land use except in the agroculture area that the amount of sulfur was increased due to the use of chemical fertilizers. In all types of land use, the organic matter content decreased with increasing soil depth, but in the contrary, the amount of sulfur increased with increasing soil depth. The pH was slightly increased in all depths and types of land use. The amount of phosphorus, potassium and magnesium was increased and mostly accumulated at the top soil and decreased with increasing soil depth. However, the amount of phosphorus was increased in agroculture and forest plantation areas and decreased in areas of shifting cultivation and enrichment planting. The potassium and magnesium content were highest in forest plantation areas and lowest in the hill evergreen forest, while the amount of calcium was highest in agroculture area and lowest in the hill evergreen forest. All of the phenomena mentioned above may be due to the influence of fire and chemical treatments. It was revealed that the change of the hill evergreen forest to other land use practices would impact the balance of nutrients in the system as well as the amount and rate of nutrient cycling. Most of the nutrients were moved and accumulated in the soil instead of storing in the form of plant biomass, Therefore, if the land were not properly used, the nutrients could be easily leached and lost from the system. |
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ที่มา:Agricultural Science Journal (วารสารวิทยาศาสตร์เกษตร)หัวเรื่อง:การศึกษาปริมาณธาตุอาหารในผลส้มโอ เพื่อประเมินการสูญเสียธาตุอาหารจากดินโดยติดไปกับผลผลิตส้มโอ |
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ที่มา:การประชุมวิชาการพืชเขตร้อนและกึ่งร้อน ครั้งที่ 7หัวเรื่อง:ธาตุอาหารในดินและพืชของมะพร้าวน้ำหอมใน อ.ดำเนินสะดวก จ.ราชบุรี |
หัวเรื่อง:ธาตุอาหารในดินปลูกส้มจุก ผู้เขียน:นางมงคล แซ่หลิม, Charassri Nualsri, Sumalee Suthipradit, Wichai panthanahiran, Suthirak Lim สื่อสิ่งพิมพ์:pdf AbstractCultivation problems of neck oranges decline at Amphur Chana, Songkhla Province, Were investigated. As essential nutrient elements were the first suspected problem, bulk soil samples around the problem site were randomly collected. The soil was mixed, sieved and employed for all glasshouse experiments. There were to find a suitable rate of basal nutrient, to evaluate fertility status of the soil and suitable rates of individual nutrient ele?ments. Maize was used as the tested plant and its shoot dry weight was employed as a measured parameter. Results demonstrated 3xAll of the basal nutrient element gave best growth of maize grown on this soil type. The soil was deficient in N, P, S, Cu, Mo and Zn. Hence, rates of these nutrient elements were studied. It was found that maximum corresponding rates for N, P, S, Cu, Mo and Zn were 120, 150, 75, 6, 0.8 and 5 kg ele?ment/ha respectively. There after, these rates of elements were used in a farmer plot to test whether these ele?ments would help in preventing the decline in growth of the neck orange. |
ที่มา:มหาวิทยาลัยเกษตรศาสตร์หัวเรื่อง:ประสิทธิภาพของระบบวนเกษตรรูปแบบต่าง ๆ ต่อการอนุรักษ์ดิน ธาตุอาหารและน้ำ ในพื้นที่ลุ่มน้ำ |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Tillage System and Fertilizer Rate Effects on Sorghum Productivity in the Central Rift Valley of Oromiya, Ethiopia) ผู้เขียน:Worku Burayu, ดร.สมบัติ ชิณะวงศ์, รองศาสตราจารย์ , รังสิต สุวรรณเขตนิคม, ดร.ธงชัย มาลา, รองศาสตราจารย์ , นางสุนันทา จันทกูล, ผู้ช่วยศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractSoil moisture and soil nutrient are the most sorghum yield limiting factors in semi-arid Oromiya. Hence, to identify appropriate crop management system for sorghum productivity, the field experiment was conducted in 2004 cropping season using factorial combination of four levels of tillage systems and four rates of fertilizer in spilt plot design at two locations. It was found that the stand count and height of sorghum varied significantly between locations, and lower stand count recorded at Wolenchity (55738 plant ha-1) than at Malkassa (61548 plant ha-1) while greater plant height was obtained at Wolenchity. Grain yield was significantly affected by location and fertilizer rate. Significantly (P?0.05) higher grain yield was obtained at Wolenchity (2381 kg ha-1) than that at Malkassa (1747 kg ha-1). Grain yield achieved at the highest fertilizer rate of 57.4-64.4 kg N-P2O5 ha-1 was significantly (P?0.01) higher than that at the current rate of 41-46 kg N-P2O5 ha-1. The highest grain yield was recorded from tie-ridge plot but varied with fertilizer rate for each location. Harvest Index (HI) followed the same pattern as the grain yield. However, significantly (P ? 0.05) higher stover and biomass yield of sorghum were obtained at Malkassa. These findings indicated that applications of fertilizer beyond 49.2-55.2 kg N-P2O5 ha-1 could give no significant yield advantage and thus, would not be economically feasible. The tie-ridge and reduced tillage tied furrow were encouraging but need further investigation to incorporate in sorghum cropping system. |
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