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• Effects of Compound Fertilizer on Growth, Yield and Economic Efficiency of Robusta Coffee in Basalt Soil of Dak Lak Province

  Nguyen Van Minh, Do Thi Nga

  Received: 02-06-2015 / Accepted: 20-10-2015

   Abstract PDF (VIETNAMESE)

  Field fertilizer experiments were conducted to identifythe most effective dosage of compoundfertilizer with 6 different levels applied to Robusta coffee in basalt soil of Dak Lak province from 2012 to 2014. All experiment plotsapplied with compound fertilizer ofYara company were compared with 260kg N + 95kg P2O5+ 240kg K2O and 10 tons of manure (application at 2-yearinterval) applied forRobusta coffee as recommended by theMinistry of Agriculture and Rural Development (control 1). The results showed that application of 2,100 kg compoundfertilizersper haper year significantly increased soil fertility as evidenced by increasedcontents of total nitrogen, available phosphorus, and available potassium, Ca and Mg in soils. Moreover, the length of reserve branches increased by20%, 100 fruitweight by18%,andcoffee bean productivityper ha by21%, but fresh coffee/coffee beanreduced by14%. The rate 2,100 kg compoundfertilizers/ha/year also gave the highergross value (VND 139.46 millions/ha/year) andhighereconomic efficiency(profit of VND 62.52 millions/ha/year) in comparison with the recommended practice.

• Study of Land Use Characteristics Red Basalt (Ferralsols) Đak Lak Province

  Pham The Trinh

  Received: 28-09-2012 / Accepted: 15-12-2012

   Abstract PDF (VIETNAMESE)

  Dak Lak province is located intheCentralHighlandwithnatural area of13,125km2andapopulationofnearly1.8millionpeopledistributed in15administrative units. Results of identifing land mapping unit by overlaytheland character maps showed theprovince's landresourcesare of great diversity, favorablefor thedevelopmentofcommercial agriculturalproduction, particularly298,365.4hectaresof redbasalt (ferralsols), accountingfor22.73 percent oftheland areaoftheprovince. Red basalt soil inDakLakprovinceis divided intofourclassification units of gentle slope and high fertility. Thissoiliswellsuited tomanyeconomic industrial perennial plants, such as coffee, rubber, cashew Basaltic soilswithslopesoflessthan150occupy 92.39 percent of the area of whichover100cmthicklayeraccountsfor84.83 percent oftheland. At present,247,190.70hectares are exploited for agricultural purpose, the rest, remains unused and non-agricultural land.

• Effects of Growing Mediaand Cutting Typeson Propagation of Black Pepper (Piper NigrumL.)

  Nguyen Thi Loan, Luc Thi Quyen

  Received: 05-05-2023 / Accepted: 20-11-2023

   Abstract PDF (VIETNAMESE)

  The experiment aimed to determine the suitable type of growing media and node number per cutting for pepper propagation in Dak Mil district, Dak Nong province. A two-factor experiment was laid out in the nursery in a randomized complete block design with 3 replicates. The first factor consisted of 5 growing media (G1: red basalt soil (soil); G2: 60% soil + 40% coir dust; G3: 60% soil + 20% coir dust + 20% vermicompost; G4: 60% soil + 40% perlite; G5: 60% soil + 20% perlite + 20% vermicompost). The second factor consisted of 3 cutting types (H1: two-node cutting; H2: three-node cutting; H3: four-node cutting). The results showed that growing media containing coir dust and vermicompost and cuttings with higher node number increased the survival rate and shooting rate, stimulated root growth, increased cutting growth and dry matter accumulation of black pepper cuttings. Growing four-node cutting on the growing media mixed from 60% soil + 20% coir dust + 20% vermicompost resulted in best viability rate, shooting rate, growth and biomass of pepper cuttings.

• EnvironmentalEfficiency of Macadamia and Coffee Intercropping on Basaltic Soils in Krong NangDistrict, Dak Lak Province

  Pham The Trinh

  Received: 20-12-2016 / Accepted: 24-04-2017

   Abstract PDF (VIETNAMESE)

  Environmental efficiency of coffee - macadamia intercropping with different ages on basalt in Krong Nang district, Dak Lak province was investigated. The results showedthat macadamia trees intercropped with coffee improved soilporousityand fertility. In these models, wilting humidity increasedwith the depth of soil moisture in comparisonwith coffee - black pepper intercroppingand pure coffeestand (Control model). Macadamia intercropped with coffee improvedthe microclimate of coffee plantations through shading effect from macadamia treesresulting inhigher air humidity (by 13.67%)in comparison with pure coffee plantation. Compared with coffee monoculture,coffee -pepper intercopping also retained higherhumidity (5.48%). In addition, coffee - macadamia intercropping reduced air temperature and wind speed by 2.43 - 2.710Cand 70 %, respectivelyas compared with coffee monoculture..