scholarly journals An analysis of the growth of leaf area of oil palms in Indonesia

1999 ◽  
Vol 35 (3) ◽  
pp. 293-308 ◽  
Author(s):  
W. GERRITSMA ◽  
F. X. SOEBAGYO
Keyword(s):  
Leaf Area ◽  
Oil Palms

Effects of Nitrogen, Phosphorus, Potassium and Magnesium on Growth of the Oil Palm

1972 ◽  
Vol 8 (4) ◽  
pp. 347-353 ◽  
Author(s):  
R. H. V. Corley ◽  
C. K. Mok
Keyword(s):  
Leaf Area ◽  
Oil Palm ◽  
Dry Matter ◽  
Fertilizer Application ◽  
Dry Matter Production ◽  
Matter Production ◽  
Oil Palms ◽  
Net Assimilation ◽  
Nitrogen Phosphorus ◽  
Bunch Yield

SUMMARYPotassium application appeared to increase dry matter production and yield of oil palms, primarily by increasing leaf area, while nitrogen increased both leaf area and net assimilation rate. Responses to phosphorus and magnesium were harder to interpret. Production of vegetative dry matter attained a fairly constant level at the higher rates of fertilizer application, while the ratio of bunch yield to total dry matter production was little affected by fertilizer treatments. The importance of these results for oil palm breeding, and their possible value in diagnosing fertilizer requirements, are briefly discussed.

scholarly journals Application of Remote Sensing to Assess the Biophysical Characteristics of Palm Oil Trees for Ecological Study

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohd Razali Sheriza ◽  
Musa Fatin Nurul ◽  
Nuruddin Ahmad Ainuddin
Keyword(s):  
Remote Sensing ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Oil Palm ◽  
Maximum Height ◽  
Area Index ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Palm Trees ◽  
Oil Palms

AbstractOil palms are an important crop for Malaysia as the main crop cultivated from agricultural lands for economic purposes. The livelihood of small growers is, in fact, very dependent on that industry. The present study employs the application of remote sensing of higher resolution to assess the biophysical characteristics of oil palms stands for a plantation in Lenggeng, Negeri Sembilan, Malay Peninsula. Band combination with the use of natural, red, blue bands and red-edge spectrum was employed to obtain early information on the oil palm stands at the site. We subsequently employed fish eye camera to collect information on leaf area index at the field. The study also measured the height and diameter at breast height of all plots established in the site. Finally, correlation was performed to establish the relationships between height-to-leaf area index relations. Diameter at breast height measuring points was scattered at the upper part of the line that formed negative relationships (R2 = -0.0313). Height was positively associated with leaf area index, a bit weaker (R2 = 0.2323). Interpolation found plots at varying elevation level. Maximum height of the trees was recorded at the highest elevation in the site, presumably due to the higher solar radiation that enhances photosynthesis. Our study demonstrates the usefulness of the finding for implementation elsewhere in assessing the biophysical characteristics of oil palm trees. The study leads to further understanding of oil palms, specifically the biophysical characteristics associated with plant productivity assessment.

White Stripe Disorder of Oil Palm (Elaeis guineensis) in Malaysia

1972 ◽  
Vol 8 (2) ◽  
pp. 161-169 ◽  
Author(s):  
J. A. Rajaratnam
Keyword(s):  
Leaf Area ◽  
Oil Palm ◽  
Photosynthetic Activity ◽  
Elaeis Guineensis ◽  
White Stripe ◽  
Spongy Mesophyll ◽  
Air Space ◽  
Oil Palms ◽  
Palisade Cells ◽  
Space Volume

SUMMARYOil palms with white stripe have greatly reduced yields. In the chlorotic areas of the leaflets, columnar palisade cells fail to develop and there is a reduction in air-space volume of the spongy mesophyll. Leaf area and photosynthetic activity are also reduced. Recovery of palms showing symptoms was spasmodic. The condition is discussed in relation to boron, to N/K ratio, polyphenols and availability of photosynthate.

Observations on Boron-deficient Oil Palms (Elaeis guineensis)

1972 ◽  
Vol 8 (4) ◽  
pp. 339-346 ◽  
Author(s):  
J. A. Rajaratnam
Keyword(s):  
Leaf Area ◽  
Dry Matter ◽  
Boron Concentration ◽  
Elaeis Guineensis ◽  
Dry Matter Production ◽  
Endogenous Auxin ◽  
Water Culture ◽  
Matter Production ◽  
Oil Palms ◽  
Leaf Boron

SUMMARYComplete nutrient ± boron treatments were imposed on seedling and young oil palms growing in sand and water culture. A number of symptoms were observed on the boron-deficient palms, including the development of high endogenous auxin levels. The relation of morphological symptoms with IAA concentration is discussed. Comparisons were made of dry matter production, leaf area and leaf boron concentration.

IMPACT OF FERTILIZERS APPLICATION ON SEED GERMINATION AND SEEDLING GROWTH OF VIGNA RADIATA

2018 ◽  
Vol 24 (2) ◽  
Author(s):  
SUPRIYA DIXIT ◽  
R. K. GUPTA
Keyword(s):  
Seed Germination ◽  
Leaf Area ◽  
Seedling Growth ◽  
Vigna Radiata ◽  
Agricultural Research ◽  
Dry Weight ◽  
Fertilizer Application ◽  
Research Field ◽  
Chemical Fertilizer ◽  
Seedling Length

Currently, a real challenge for the workers in the agricultural research field is to stop or reduce the use of expensive agrochemicals/ chemical fertilizers which are hazardous to the environment as well as human health. Present study was aimed to improve the growth and obtain optimum yield of Vigna crop with eco-friendly, non-toxic way and to reduce the use of agrochemical/chemical fertilizer application in agricultural activities. A pot experiment was conducted to study the effect of chemical fertilizer (DAP) and biofertilizer ( Rhizobium strain) separately and in combination on seed germination and seedling growth (at 30 days) based on morphological parameters such as seedling length (cm), fresh weight (g), dry weight (g) and leaf area (cm)2 of Vigna radiata (L.) Wilczek. After one month (30 Days) observations, it was found that seedling length, fresh and dry weights and leaf area were maximum in T4 and minimum in T15, T7 and T8 favored improved seedling length and leaf area whereas T7, T8, and T9 favored improved fresh and dry weights as compared to control.

UTILIZING COMBINATION OF HERBICIDE COMMAND AND GROWTH STIMULATORS MELAFEN AND EMISTIM C FOR TOBACCO SEEDLING GROWING

2020 ◽  
Keyword(s):  
Toxic Effect ◽  
Leaf Area ◽  
Economic Effect ◽  
Seedling Development ◽  
Root Mass ◽  
Qualitative Properties ◽  
Tobacco Plants ◽  
Prolonged Effect ◽  
Agricultural Plants

Efficiency of combination of soil herbicide Command (CE 0.02 ml/m2) and growth stimulators Melafen and Emistim S for tobacco seedling growing in sheltered ground has been studied. Before studies inhibition properties of herbicide on first stage of tobacco growing were found. For decreasing effect of herbicide ’s depression and increasing growing processes researches during greenhouse and field stages have been carried. It has been found that soaking seeds in solution of growth stimulator Melafen (concentration 0.05 %) and Emistim S (concentration 0.00001 %) during 3 hours in combination with further treatments on basic stages of seedling development (cotyledon and ready for transplanting before pulling out) led not only to decreasing toxic effect of herbicide but also increasing qualitative properties of tobacco plants. Growth stimulators led to increasing length of plants from collar to growing point by 46-62 %, to end of tips - by 20-35 %, above ground plant mass - by 42 - 86 %, root mass - by 32 %. It was also noticed 28 - 36 % increasing outcome of standard seedlings from m2 in time of transplanting. Due to prolonged effect of Melafen and Emistim S seedlings transplanted into field were with increased surviving properties. Later, due to increased growing rate it was noticed increasing leaf area by 9-18 % and productivity - by 16-24 %. Economic effect due to utilizing growth stimulators Melafen and Emistim S during seedling stage reaches 360 and 470 rubles/m2 and during field stage - 66 and 98 th.rubles/ha respectively. Offered elaboration can be utilized for protecting systems of different agricultural plants where utilizing soil herbicides is recommended. Also quality of cured tobacco grown with stimulators had been improved.

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