scholarly journals Evaluasi Deskriptif Umur Panen Melon (Cucumis melo, L) Di Pekanbaru

2018 ◽  
Vol 14 (1) ◽  
pp. 65-71
Author(s):  
Surtinah Surtinah
Keyword(s):  
Organic Matter ◽  
Water Stress ◽  
Growth Regulators ◽  
Cucumis Melo ◽  
Research Method ◽  
Stress Condition ◽  
Environmental Modification ◽  
Water Stress Condition ◽  
Cucumis Melo L ◽  
Descriptive Qualitative

The objective of the study was to examine the factors that caused melon harvesting age in Pekanbaru faster than in the melon-producing regions. The research method used is descriptive qualitative. The results of the discussion found that the factors that influence the harvesting age of melon in Pekanbaru City are the water stress condition, the unfulfilled essential ingredients, the insufficient planting medium of organic matter, the importance of growth regulators that can enlarge the fruit and maintain the age of the plant, environmental modification.

scholarly journals Organic Matter and Phosphorus Fertilizer Application to Sustain Maize Growth under Water Stress Condition in Calcareous Soil

2017 ◽  
Vol 2 (6) ◽  
pp. 216
Author(s):  
Sri Rahayu Utami ◽  
H. Rohmawatia ◽  
W. J. N. Kumalontang ◽  
Sugeng Prijono
Keyword(s):  
Organic Matter ◽  
Water Stress ◽  
Water Scarcity ◽  
Stress Condition ◽  
Gliricidia Sepium ◽  
P Uptake ◽  
Tithonia Diversifolia ◽  
Maize Growth ◽  
Water Stress Condition ◽  
P Fertilizer

Crop growth is normally rather limited in calcareous soils, due to the low phophorus availability and water scarcity. Organic matter (OM) is commonly applied to reduce P fixation, as also improving other nutrients content and water availability in the soil.  Since calcareous soils often encounter water scarcity especially in dry period, the effectiveness of OM under water stress condition is still interesting to study. An incubation experiment was conducted to study the effect of water stress, P-fertilizer and organic matter application on P-uptake and maize growth in calcareous soil. Soil samples used for this study, were taken from 0-20 cm depth, in Pagak, South Malang, East Java. A complete randomized design was used, with 3 factors and 3 replications. Factor 1 was consisted of 3 water stress level, i.e no stress (S0), slightly stress (S1), and moderately stress (S2). Factor 2 was consisted of 2 Phosphorus level: with (200 kg SP36 per Ha). and without P-fertilizer. Factor 3 was OM application (12 Mg Ha-1), i.e. without OM (B0), Tithonia diversifolia (B1), Gliricidia sepium (B2), and combination of Tithonia diversifolia and Gliricidia sepium (B3).Soil samples were added with fertilizer and organic matter, and incubated within 2 weeks. Water stress treatment were conducted after incubation period. Phosphorus availability (P-Olsen and P-labile) in the soil was measured at 0, 28, and 56 day after planting (dap). Crop height was measured at 14, 28, 42, and 56 dap. Whereas P-uptake and biomass dry weight were measured at 56 dap. The results showed that OM application increased P-uptake, crop height and biomass dry weight. The effect was slightly improved by P-fertilizer application, but decreased as the water stress level increased. With or without P fertilizer, Tithonia diversifolia was more effective than Gliricidia sepium, when water was sufficient. At slightly water stress condition, the different between the two OM sources became less significant, especially when P fertilizer was added. Under moderately water stress condition, application of OM and P-fertilizer had no significant impact on maize growth. Keywords: P-availability;P-uptake; sustainable agriculture; water scarcity.

scholarly journals Effects of composted oil palm bunch wastes and chemical fertilizer on growth of oil palm seedling under water stress condition

Agro-Science ◽  
2015 ◽  
Vol 12 (1) ◽  
pp. 17
Author(s):  
S Ovie ◽  
GU Nnaji ◽  
PO Oviasogie ◽  
PE Osayande ◽  
P Irhemu
Keyword(s):  
Water Stress ◽  
Oil Palm ◽  
Stress Condition ◽  
Chemical Fertilizer ◽  
Water Stress Condition ◽  
Palm Bunch

scholarly journals Competition between drought-tolerant upland rice cultivars and weeds under water stress condition

2013 ◽  
Vol 31 (2) ◽  
pp. 291-302 ◽  
Author(s):  
F.B. Cerqueira ◽  
E.A.L. Erasmo ◽  
J.I.C. Silva ◽  
T.V. Nunes ◽  
G.P. Carvalho ◽  
...  
Keyword(s):  
Water Stress ◽  
Leaf Area ◽  
Stress Condition ◽  
Upland Rice ◽  
Total Concentration ◽  
Dry Weight ◽  
Rice Cultivars ◽  
Drought Tolerant ◽  
Water Stress Condition ◽  
Water Conditions

The objective of this study was to evaluate the competitiveness of two cultivars of upland rice drought-tolerant, cultured in coexistence with weed S. verticillata, under conditions of absence and presence of water stress. The experiment was conducted in a greenhouse at the Experimental Station of the Universidade Federal de Tocantins, Gurupi-TO Campus. The experimental design was completely randomized in a factorial 2 x 2 x 4 with four replications. The treatments consisted of two rice cultivars under two water conditions and four densities. At 57 days after emergence, were evaluated in rice cultivars and weed S. verticillata leaf area, dry weight of roots and shoots and total concentration and depth of roots. Was also evaluated in rice cultivars, plant height and number of tillers. Water stress caused a reduction in leaf area, the concentration of roots and vegetative components of dry matter (APDM, and MSR MST) of rice cultivars and Jatoba Catetão and weed S. verticillata. The competition established by the presence of the weed provided reduction of all vegetative components (MSPA, and MSR MST) of cultivars and Jatoba Catetão. It also decreased the number of tillers, the concentration of roots and leaf area. At the highest level of weed competition with rice cultivars, a greater decrease in vegetative components and leaf area of culture, regardless of water conditions.

scholarly journals The effect of growth regulators on sex expression in melon (Cucumis melo L.)

2013 ◽  
Vol 13 (3) ◽  
pp. 165-171 ◽  
Author(s):  
Zdenka Girek ◽  
Slaven Prodanovic ◽  
Jasmina Zdravkovic ◽  
Tomislav Zivanovic ◽  
Milan Ugrinovic ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
Growth Regulators ◽  
Cucumis Melo ◽  
Staminate Flower ◽  
Sex Expression ◽  
Male Flowers ◽  
Cucumis Melo L ◽  
Perfect Flower

Seven traits related to flowering and sex expression in melon were studied and their reaction to application of two growth regulators (ethrel and gibberellic acid) was observed. Four monoecious genotypes (Sesame, ED-3, ED-4, Pobeditel) and four andromonoecious genotypes (Chinese muskmelon, Anannas, Fiata, A2-3lb) had been used for experiments. According to the results, ethrel had higher effects on the investigated traits than gibberellic acid. Ethrel increased the number of perfect flowers per plant for 7.18 (31.42%), reduced the number of male flowers per plant for 21.47 (17.98%), affected earlier appearance of the first pistillate/perfect flower for 3.68 days, and delayed the appearance of the first staminate flower for 16.07 days. Changes in the last two traits caused an extension of the period from the emergence of the first pistillate/perfect to the first staminate flower from 0.1 to 21.57 days, which represents the strongest effect of ethrel. Gibberellic acid had generally opposite effects on the studied traits.

scholarly journals Coupling Hyperspectral Remote Sensing Data with a Crop Model to Study Winter Wheat Water Demand

2019 ◽  
Vol 11 (14) ◽  
pp. 1684 ◽  
Author(s):  
Chao Zhang ◽  
Jiangui Liu ◽  
Taifeng Dong ◽  
Elizabeth Pattey ◽  
Jiali Shang ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Water Stress ◽  
Winter Wheat ◽  
Water Demand ◽  
Stress Condition ◽  
Remote Sensing Data ◽  
Crop Model ◽  
Actual Evapotranspiration ◽  
Sensing Data ◽  
Water Stress Condition

Accurate information of crop growth conditions and water status can improve irrigation management. The objective of this study was to evaluate the performance of SAFYE (simple algorithm for yield and evapotranspiration estimation) crop model for simulating winter wheat growth and estimating water demand by assimilating leaf are index (LAI) derived from canopy reflectance measurements. A refined water stress function was used to account for high crop water stress. An experiment with nine irrigation scenarios corresponding to different levels of water supply was conducted over two consecutive winter wheat growing seasons (2013–2014 and 2014–2015). The calibration of four model parameters was based on the global optimization algorithms SCE-UA. Results showed that the estimated and retrieved LAI were in good agreement in most cases, with a minimum and maximum RMSE of 0.173 and 0.736, respectively. Good performance for accumulated biomass estimation was achieved under a moderate water stress condition while an underestimation occurred under a severe water stress condition. Grain yields were also well estimated for both years (R2 = 0.83; RMSE = 0.48 t∙ha−1; MRE = 8.4%). The dynamics of simulated soil moisture in the top 20 cm layer was consistent with field observations for all scenarios; whereas, a general underestimation was observed for total water storage in the 1 m layer, leading to an overestimation of the actual evapotranspiration. This research provides a scheme for estimating crop growth properties, grain yield and actual evapotranspiration by coupling crop model with remote sensing data.

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