Tingkat Adaptasi Beberapa Varietas Kedelai Terhadap Naungan

The aim of this research was to identify adaptability of 7 soybean varieties under five levels of shading. The soybean varieties tested were Tanggamus, Pangrango, Sinabung, Willis, Ijen, Lokon, and Malabar, while the five shading treatments were: no shading (N0), 15%-15% (N1), 30%-15% (N2), 45%-15% (N3), and 60%-15% (N4). The trial in each shading environment was arranged in a randomized block design with three replications. The data collected were growth variables (leaf numbers, plant heights, and stem diameters), number of filled pods, and seed yields. Data of the seed yields were analyzed using the Additive Main Effects and Multiplicative Interaction (AMMI) analysis method. Results showed that adaptability of soybean varieties to different levels of shading varied. Based on the interaction Ammi-1 biplot graph, variety Ijen was not suitable to be grown under shading environment. Varieties Sinabung and Wilis were more suitable for low level of shading environment (15%); Malabar was more suitable for moderate level of shading (45%), and Lokon was more suitable for planting under shading (60%) condition. Variety Pangrango was considered as adaptive to all levels of shading environments

Peran kualitas pelarut dalam efektivitas amonium glufosinat dan isopropilamin glifosat untuk pengendalian Cyperus rotundus pada pertanaman kedelai. The role of water solvent quality on the effectiveness of ammonium ...

Effectiveness of a herbicide is influenced by crop variety, weed growth stage, time of spraying, temperature, soil moisture, relative humidity, quality of solvent, and chemical properties of soil The aim of this research is to evaluate the influence of EDTA and water solvent quality on the effectiveness of ammonium gluphosinate and isopropilamine gliphosate in controlling Cyperus rotundus on soybean cultivation . A pot experiment was performed in dry season 1997 using complete randomized design (CRD) with six replications. Three EDTA concentrations, ie., 0.0, 0.5, and 1.0%, were cross combined with 0, 120, 240 and 480 g/ha of isopropilamine gliphosate and 75, 150 and 225 g/ha of ammonium gluphosinate. Ten around-I- cm diameter of Cyperus rotundus tubers were planted in each pot. The ammonium gluphosinate and isopropilamine gliphosate, were diluted in two water solvent qualities, each obtained from irrigation water of Kendalpayak experimental farm and ground water of Jambegede experimental farm to make a volume of 200 I/ha. The herbicides solution was sprayed onto the soils 14 days after the tubers, while soybeans were sown at seven days after herbicides application. The results show that the addition of 0.5 to 1.0% of EDTA into the water solvent with Ca+ Mg content ranging fi-om 26.86 to 44.88 ppm canceled the effectiveness of ammonium gluphosinate and isopropilamine gliphosate in controlling Cyperus rotundus. These herbicides, however, were more effective in controlling the growth of Cyperus rotundus as well as increased soybean yield when diluted in water with Ca+Mg content 26.86 ppm. It is suggested that further research should be performed using various qualities of water solvents applied to crops and weeds. Key words: Cyperus rotundus, isopropilamin gliphosate, ammonium gluphosinate, soybea

Analisis Nilai Tengah Generasi Untuk Umur Panen Keturunan Persilangan Tiga Varietas Kedelai

Genetic parameters of a character, which is estimated using genetic analysis approach, is important in a character improvement. The aim of this research was to examine the gene action of days to maturity character on soybean using generation mean analysis. The research consisted two steps, first was preparing four populations (F1, BC1.1, BC1.2 and F2) of three single crosses, i.e. Nanti × Grobogan, Grobogan × Malabar, and Nanti × Malabar. The second step was testing those populations consisting of P1, P2, F1, F2, BC1.1 and BC1.2 in the field at Jambegede Experimental Station, Malang, East Java, from July to September 2009. The results showed that there were interaction between the gene loci on the inheritance of days to maturity, from the three cross combinations under study. The role of additive gene action and the influence of dominant inheritance contributed jointly, affecting days to maturity of early maturity (Grobogan) and early maturity (Malabar) cross. The crossing of very late maturity (Nanti) with early maturity (Grobogan or Malabar) showed that early maturity was probably controlled by additive recessive genes