scholarly journals Pengaruh Varietas, Status K-Tanah, dan Dosis Pupuk Kalium terhadap Pertumbuhan, Hasil Umbi, dan Serapan Hara K Tanaman Bawang Merah

2013 ◽  
Vol 22 (3) ◽  
pp. 233
Author(s):  
Rini Rosliani ◽  
Rofik Sinung Basuki
Keyword(s):  
Dry Weight ◽  
Nutrient Content ◽  
Fertility Level ◽  
K Uptake ◽  
Optimum Dosage ◽  
Central Java ◽  
K Fertilizer ◽  
P Fertilizer ◽  
Soil K Status ◽  
Bulb Yield

ABSTRAK. Pemupukan sebaiknya didasarkan pada kebutuhan tanaman dan kesuburan lahan agar diperoleh hasil yang optimal. Adanya keragaman tanah dan lingkungan yang cukup tinggi di Indonesia menyebabkan kebutuhan pupuk berbeda dari satu lokasi ke lokasi lainnya. Penelitian bertujuan untuk mendapatkan dosis pupuk K optimum untuk dua varietas bawang merah pada status K-tanah yang berbeda. Metode penelitian terdiri atas survei status K-tanah yang dilakukan di sentra produksi bawang merah di dataran rendah Jawa Barat dan Jawa Tengah, dan percobaan pot yang dilakukan di Rumah Kasa Balai Penelitian Tanaman Sayuran Lembang dari Bulan Maret sampai dengan Desember 2008. Rancangan percobaan yang digunakan untuk percobaan pot ialah petak terpisah dengan tiga ulangan. Petak utama ialah bawang merah varietas Bangkok dan Kuning. Anak petak ialah status hara  K-tanah, yaitu status K-tanah rendah (&lt;20 ppm K2O), sedang (21–40 ppm K2O), dan tinggi (&gt;41 ppm K2O). Anak-anak petak ialah dosis pupuk K terdiri atas 0, 60, 120, 180, dan 240 kg/ha K2O.  Pupuk N (150 kg/ha) dan P (150 kg/ha P2O5) diberikan sebagai pupuk dasar. Hasil penelitian menunjukkan bahwa tidak terjadi interaksi antara varietas, status K-tanah, dan dosis pupuk K terhadap bobot kering tanaman, luas daun, hasil bobot umbi segar, dan bobot umbi kering eskip bawang merah. Namun serapan hara K tanaman dan residu pupuk K dalam tanah dipengaruhi oleh interaksi ketiga faktor tersebut. Hubungan antara hasil umbi bawang merah varietas Bangkok dan Kuning dengan dosis pupuk K pada semua status K-tanah bersifat kuadratik. Dosis pupuk K optimum untuk varietas Bangkok ialah 126,67 kg/ha K2O pada status K-tanah rendah, 170,00 kg/ha K2O pada status K-tanah sedang, dan 1,5 kg/ha K2O pada status K-tanah tinggi, sedangkan dosis pupuk K optimum untuk varietas Kuning ialah 214,29 kg/ha K2O pada status K-tanah rendah, 216,67 kg/ha K2O pada status K-tanah sedang, dan 106,50 kg/ha K2O pada status K-tanah tinggi. Hasil umbi dan serapan hara tanaman varietas Bangkok dan Kuning pada status K-tanah tinggi nyata lebih tinggi dibandingkan pada status K-tanah rendah dan K-tanah sedang. Makin tinggi status K-tanah dan dosis pupuk K, maka makin tinggi pula residu K dalam tanah.<br /><br />ABSTRACT. Sumarni, N, Rosliani, R, Basuki, RS, and Hilman, Y 2012. Effects of Varieties, Soil-K Status, and K Fertilizer Dosages on Plant Growth, Bulb Yield, and K Uptake of Shallots Plant. In order to get the optimum yield, fertilization should be based on plant need of nutrient and nutrient content of soil. The presense of high diversities of soil and environment in Indonesia cause the fertilizer needed are different from one location to another. This research methodologies were survey of soil-K status on some shallots production areas in lowland of West and Central Java, and pot experiment that was carried out at Screenhouse of Indonesian Vegetable Research Institute from March to December 2008. The aim of this experiment was to find out the optimum dosage of K fertilizer for two shallots varieties on several soil fertility level (soil-K status). A split-split plot design with three replications was used in this experiment. As main plots were shallots varieties, consisted of Bangkok and Kuning varieties. Subplots were the content/status of soil-K, consisted of low (&lt;20 ppm K2O), medium (21–40 ppm K2O), and high (&gt;41 ppm K2O). Sub-subplots were K fertilizer dosages, consisted of 0, 60, 120, 180, and 240 kg/ha K2O. N fertilizer (150 kg/ha N) and P fertilizer (150 kg/ha P2O5) were applied as basic fertilizers. The results showed that there were no interaction between varieties, soil-K status, and K fertilizer dosages on plant leaf area, plant dry weight, fresh and dry weight of bulb yield of shallots. But K uptake by shallots plant and residual of K fertilizer in soil were affected by the three those factors. The curves of the relationship between K fertilizer dosages and bulb yield of Bangkok and Kuning varieties on all soil-K status were quadratics. The optimum dosage of K fertilizer for Bangkok variety were 126.67 kg/ha K2O on low of soil-K status, 170.00 kg/ha K2O on medium of soil-K status, and 1.50 kg/ha K2O on high of soil-K status; whereas for Kuning variety were 214.29 kg/ha K2O on low of soil-K status, 216.67 kg/ha K2O on medium of soil-K, and 106.50 kg/ha K2O on high of soil-K status.The bulb yield and K uptake of Bangkok and Kuning varieties were significantly higher on high soil-K status than on low and medium of soil-K status. The more higher of K fertilizer dosages and soil-K status gave the more higher of K residual of K fertilizer in soil.<br /><br />

scholarly journals Respons Tanaman Bawang Merah terhadap Pemupukan Fosfat pada Beberapa Tingkat Kesuburan Lahan (Status P-Tanah)

2013 ◽  
Vol 22 (2) ◽  
pp. 130 ◽  
Author(s):  
N Sumarni ◽  
R Rosliani ◽  
R S Basuki ◽  
Yusdar Hilman
Keyword(s):  
Soil Fertility ◽  
Response Curve ◽  
Dry Weight ◽  
Optimal Dosage ◽  
Soil P ◽  
Optimum Dosage ◽  
Split Plot ◽  
P Fertilizer ◽  
Bulb Yield ◽  
Plot Design

ABSTRAK. Pemupukan sebaiknya didasarkan pada kebutuhan tanaman akan unsur hara dan kandungan hara dalam tanah, agar diperoleh hasil yang optimal. Tujuan penelitian ialah untuk mendapatkan dosis optimal pupuk P pada dua varietas bawang merah pada beberapa tingkat kesuburan tanah (status P-tanah). Penelitian dilakukan di Rumah Kasa Balai Penelitian Tanaman Sayuran Lembang, dari bulan Mei sampai dengan Desember 2008. Rancangan percobaan yang digunakan ialah split-split plot design dengan tiga ulangan. Petak utama ialah varietas bawang merah, terdiri atas varietas Bangkok dan Kuning. Anak petak ialah kandungan/status P-tanah (Bray 1), terdiri atas rendah (&lt;15 ppm P2O5), sedang (16–25 ppm P2O5), dan tinggi (&gt;26 ppm P2O5). Anak-anak petak ialah dosis pupuk P (P2O5), terdiri atas 0, 60, 120, 180, dan 240 kg/ha. Pupuk N dan K diberikan sebagai pupuk dasar dengan dosis N 150 kg/ha dan K2O 150 kg/ha. Hasil penelitian menunjukkan bahwa terjadi interaksi antara varietas, status P-tanah, dan dosis pupuk P terhadap luas daun, bobot umbi segar, dan bobot umbi kering eskip per tanaman, serta serapan P tanaman bawang merah. Pada status P-tanah rendah dan sedang, dosis optimal pupuk P untuk varietas Bangkok dan Kuning masih belum diketahui, karena kurva respons hubungan antara dosis pupuk P dan hasil umbi kering eskip masih linier. Pada status P-tanah tinggi, hubungan antara dosis pupuk P dan hasil umbi kering eskip varietas Bangkok ataupun Kuning bersifat kuadratik. Hasil umbi kering eskip maksimal diperoleh dengan dosis pupuk P sebesar 126,50 kg/ha P2O5 untuk varietas Bangkok dan 0 kg/ha P2O5 untuk varietas Kuning. Makin tinggi dosis pupuk P yang diberikan, maka makin tinggi pula residu pupuk P terdeteksi dalam tanah. Implikasi hasil penelitian ialah kebutuhan  pupuk P yang optimal pada bawang merah berbeda bergantung pada status P-tanah dan varietas yang digunakan.<br /><br />ABSTRACT. Sumarni, N, Rosliani, R, Basuki, RS,  and Hilman, Y 2012. Response of Shallots Plant to Phosphat Fertilization on Several Soil Fertility Levels (Soil-P Status). To achieve an optimum yield, fertilization should be applied based on plant nutrient requirement and soil nutrient content. This experiment was carried out at Screenhouse of Indonesian Vegetable Research Institute from May to December 2008, to find out the optimum dosage of P fertilizer for two shallots varieties on several soil fertility levels (soil-P status). A split-split plot design with three replications was set up for this experiment. Main plots were shallots varieties i.e.: Bangkok and Kuning. Subplots were three soil-P statuses i.e.: low (&lt;15 ppm P2O5), medium (16–25 ppm P2O5), and high (&gt;26 ppm P2O5). Sub-subplots were five levels of P fertilizer dosage of 0, 60, 120, 180, and 240 kg/ha P2O5. Nitrogen fertilizer of 150 kg/ha and K fertilizer (K2O) of 150 kg/ha were applied to all. The results showed that there were interaction effect among varieties, soil-P status, and P fertilizer dosages influencing leaf area, fresh, and dry weight of bulb yield, and P uptake by shallots plant. The optimal dosage of P fertilizer for Bangkok and Kuning varieties on low and medium of soil-P status was still unknown yet, since the relation response curve of relationship between P fertilizer dosages and dry bulb yield was still linear. Meanwhile, in high of soil-P status, the response curve was quadratic for both Bangkok and Kuning varieties. The maximum dry bulb yield was obtained by 126.50 kg/ha P2O5 for Bangkok and 0 kg/ha P2O5 for Kuning. The higher of P fertilizer dosage applied, the higher of residual of P fertilizer detected in soil. The optimum dosage of P fertilizer for shallots production was different depend on variety and soil-P status.<br />

Comparison of the effects of potassium fertilizer on the yield, potassium content and quality of 22 different vegetable and agricultural crops

1980 ◽  
Vol 95 (2) ◽  
pp. 441-456 ◽  
Author(s):  
D. J. Greenwood ◽  
T. J. Cleaver ◽  
Mary K. Turner ◽  
J. Hunt ◽  
K. B. Niendorf ◽  
...  
Keyword(s):  
Dry Matter ◽  
General Relation ◽  
Dry Weight ◽  
Fertilizer Application ◽  
Optimum Level ◽  
Potassium Fertilizer ◽  
Plant Weight ◽  
K Fertilizer ◽  
P Fertilizer ◽  
The Difference

SUMMARYSixty-one experiments with 15 levels of K fertilizer in the presence of excess N and P fertilizer were carried out on adjacent sites of the same field. Yield was always related to level of K fertilizer by a ‘diminishing returns’ type curve, and a derived equation, which defined relative responsiveness in terms of a single parameter, fitted the data for each crop very satisfactorily. Although the responsiveness of many of the crops was similar there were marked differences and the optimum levels of K (defined as the level at which a further 10 kg/ha increased yield by 1%) varied from 0 to 360 kg/ha, depending on the crop. Responsiveness was largely independent of the plant family to which the crop belonged, but was related to the mean plant weight atharvest; the larger the weight the less reponsive the crop. No general relation existed between responsiveness and duration of growth.The % K in the dry matter of leaves (including stems) at harvest of crops receiving the optimum levels of K fertilizer was mainly determined by the family. It was generally between 0·9 and 1·1 for the Amaryllidaceae, between 1·1 and 1·2 for the Leguminosae and between 1·9 and 2·5% for the Cruciferae. The difference between the % K in the dry matter with the optimum level of K fertilizer and that with no fertilizer was proportional to responsiveness. Percentage K at harvest was a good indicator of the extent to which crop growth was restricted by lack of potassium.At harvest crops receiving the optimum levels of K fertilizer contained between 29 and 220 kg/ha of K, but uptake increased asymptotically to a maximum as K applications were raised to higher levels. Maximum uptake for nearly all crops was almost double the uptake with the optimum fertilizer application.Percentage recovery of 100 kg/ha of added K fertilizer varied between 8 and 70%, roughly in proportion to the total crop dry weight, which varied between 1 and 15 t/ha.Effects of level of K fertilizer on crop quality were also measured and over the practical range of applications the effects were generally small.The differences between the K requirements of crops are discussed and it is argued that the responsiveness of one crop relative to that of another would be expected to be similar on a range of soils.

scholarly journals Penentuan Dosis Optimum Pemupukan N, P, dan K pada Tanaman Kacang Bogor [Vigna subterranea (L.) Verdcourt]

2016 ◽  
Vol 43 (3) ◽  
pp. 193 ◽  
Author(s):  
Sri Ayu Dwi Ayu Dwi Lestari ◽  
Maya Melati ◽  
Heni Purnamawati
Keyword(s):  
Block Design ◽  
Dry Weight ◽  
Fertilizer Application ◽  
Bambara Groundnut ◽  
Optimum Rate ◽  
Shoot Dry Weight ◽  
P Content ◽  
K Fertilizer ◽  
P Fertilizer ◽  
Leaf P

<p>ABSTRACT</p><p>Bambara groundnut is considered tolerant to drought and unfertile soil; therefore, has higher potential to be cultivated. The average yield of dry pod weight from agricultural fields in Indonesia is still low (&lt; 4 ton ha-1); hence, the cultivation technique must be improved. Fertilizer is the main input to increase yield of Bambara groundnut, but the optimum rates of N, P, and K have not been determined. Therefore, the objectives of the research were to determine the optimum rate of N, P, and K fertilizer for Bambara groundnut production. Three parallel experiments were conducted at Cikarawang Experimental State, Dramaga, Bogor from March to July 2013. Each experiment tested different rates of N or P or K fertilizer with compeletely randomized block design and three replications. The fertilizer rates were 0, 50, 100, 150, and 200% of recommendation rate (100% N = 100 kg Urea ha-1, 100% P = 150 kg SP-36 ha-1, 100% K = 75 kg KCl ha-1). The results showed that leaf P content increased linearly with N fertilizer application. Leaf N content linearly decreased with P fertilizer application. Leaf P content and shoot dry weight quadratically increased with K fertilizer application. The optimum rates of N and P fertilizer was unable to be determined due to insignificant response of several variables. Optimum rate of K fertilizer ranged 86.4-118.95 kg KCl ha-1.</p><p>Keywords: leaf nutrients, multi nutrient response, recommendation rate</p>

scholarly journals Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate

Membranes ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 64 ◽  
Author(s):  
Tobias Gienau ◽  
Artjom Ehrmanntraut ◽  
Matthias Kraume ◽  
Sandra Rosenberger
Keyword(s):  
Membrane Filtration ◽  
Recovery Process ◽  
Ozone Treatment ◽  
Organic N ◽  
Nutrient Concentrations ◽  
Particle Removal ◽  
Process Chain ◽  
K Fertilizer ◽  
P Fertilizer ◽  
Biogas Plants

Membrane filtration of biological suspensions is frequently limited by fouling. This mechanism is well understood for ultrafiltration of activated sludge in membrane bioreactors. A rather young application of ultrafiltration is the recovery of nutrients from anaerobic digestates, e.g., from agricultural biogas plants. A process chain of solid/liquid separation, ultrafiltration, and reverse osmoses separates the digestate into different products: an organic N-P-fertilizer (solid digestate), a recirculate (UF retentate), a liquid N-K-fertilizer (RO retentate) and water. Despite the preceding particle removal, high crossflow velocities are required in the ultrafiltration step to overcome fouling. This leads to high operation costs of the ultrafiltration step and often limits the economical application of the complete process chain. In this study, under-stoichiometric ozone treatment of the ultrafiltration feed stream is investigated. Ozone treatment reduced the biopolymer concentration and apparent viscosity of different digestate centrates. Permeabilities of centrate treated with ozone were higher than without ozone treatment. In a laboratory test rig and in a pilot plant operated at the site of two full scale biogas plants, ultrafiltration flux could be improved by 50–80% by ozonation. Nutrient concentrations in the fertilizer products were not affected by ozone treatment.

scholarly journals Effect of different levels of humic acids on the nutrient content, plant growth, and soil properties under conditions of salinity

2011 ◽  
Vol 6 (No. 1) ◽  
pp. 21-29 ◽  
Author(s):  
H. Khaled ◽  
H.A. Fawy
Keyword(s):  
Plant Growth ◽  
Humic Substances ◽  
Humic Acids ◽  
Foliar Application ◽  
N Uptake ◽  
Seedling Emergence ◽  
Dry Weight ◽  
Nutrient Content ◽  
Nutrient Elements ◽  
A Minor

In this study, the effects were investigated of salinity, foliar and soil applications of humic substances on the growth and mineral nutrients uptake of Corn (Hagein, Fardy10), and the comparison was carried out of the soil and foliar applications of humic acid treatments at different NaCl levels. Soil organic contents are one of the most important parts that they directly affect the soil fertility and textures with their complex and heterogenous structures although they occupy a minor percentage of the soil weight. Humic acids are an important soil component that can improve nutrient availability and impact on other important chemical, biological, and physical properties of soils. The effects of foliar and soil applications of humic substances on the plant growth and some nutrient elements uptake of Corn (Hagein, Fardy10) grown at various salt concentrations were examined. Sodium chloride was added to the soil to obtain 20 and 60mM saline conditions. Solid humus was applied to the soil one month before planting and liquid humic acids were sprayed on the leaves twice on 20<sup>th</sup> and 40<sup>th</sup> day after seedling emergence. The application doses of solid humus were 0, 2 and 4 g/kg and those of liquid humic acids were 0, 0.1 and 0.2%. Salinity negatively affected the growth of corn; it also decreased the dry weight and the uptake of nutrient elements except for Na and Mn. Soil application of humus increased the N uptake of corn while foliar application of humic acids increased the uptake of P, K, Mg,Na,Cu and Zn. Although the effect of interaction between salt and soil humus application was found statistically significant, the interaction effect between salt and foliar humic acids treatment was not found significant. Under salt stress, the first doses of both soil and foliar application of humic substances increased the uptake of nutrients.

scholarly journals Effect of NPK fertilization on production and leaf nutrient content of eucalyptus minicuttings in nutrient solution

2011 ◽  
Vol 35 (1) ◽  
pp. 249-254
Author(s):  
José Pereira Carvalho Neto ◽  
Enilson de Barros Silva ◽  
Reynaldo Campos Santana ◽  
Paulo Henrique Grazziotti
Keyword(s):  
Experimental Design ◽  
Nutrient Solution ◽  
Plant Material ◽  
Management Practice ◽  
Dry Weight ◽  
Nutrient Content ◽  
Fractional Factorial ◽  
Nutrient Contents ◽  
Adequate Nutrient ◽  
Npk Fertilization

Adequate nutrient levels in plants vary according to the species or clone, age and management practice. Therefore, adjustments of the nutrient solution are often necessary according to the plant material for multiplication. This study aimed to evaluate the influence of NPK fertilization on production and leaf nutrient contents of eucalyptus cuttings in nutrient solution. The study was conducted from November 2008 to January 2009 in a greenhouse. The experimental design was completely randomized fractional factorial (4 x 4 x 4)½, with a total of 32 treatments with three replications. The treatments consisted of four doses of N (50, 100, 200 and 400 mg L-1) as urea, P (7.5, 15, 30 and 60 mg L-1) in the form of phosphoric acid and K (50, 100, 200 and 400 mg L-1) in the form of potassium chloride in the nutrient solution. Only the effect of N alone was significant for the number and dry weight of minicuttings per ministump, with a linear decreasing effect with increasing N levels. The highest number of cuttings was obtained at a dose of 50, 7.5 and 50 mg L-1 of N, P and K, respectively.

scholarly journals Effect of Planting Date and Gibberellic Acid on the Growth and Yield of Garlic

2010 ◽  
pp. 132-140 ◽  
Author(s):  
MA Islam ◽  
MH Reza ◽  
SMAHM Kamal ◽  
MA Wazed ◽  
KM Islam
Keyword(s):  
Gibberellic Acid ◽  
Plant Height ◽  
Dry Matter ◽  
Dry Weight ◽  
Planting Date ◽  
Growth And Yield ◽  
Planting Time ◽  
Local Cultivar ◽  
Number Of Leaves ◽  
Bulb Yield

An experiment was conducted with a local cultivar of garlic to study the effects of planting date and gibberellic acid on the growth and yield of garlic at the field laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh during November 2001 to April 2002. Early planting influenced the plant height, leaf number, bulb diameter and total dry matter. With the delay in planting time starting from November 7, the yield was chronologically reduced in later plantings. Significantly the highest bulb yield (2.67 t/ha) was recorded when planting was done on November 7 and lowest yield (0.92 t/ha) was obtained from December 22 planted crop. Bulb yield was higher in control plants than those of GA3 treated plants. The interaction effects of planting date and different concentrations of GA3 differed significantly in respect of plant height, number of leaves, bulb diameter and dry weight of roots, leaves and bulbs and yield of garlic.

An experiment begun in 1958 measuring effects of N, P and K fertilizers on yield and N, P and K contents of grass:2. Residual effects on arable crops, 1968–76

1980 ◽  
Vol 95 (3) ◽  
pp. 583-595 ◽  
Author(s):  
A. Penny ◽  
F. V. Widdowson
Keyword(s):  
Winter Wheat ◽  
Spring Wheat ◽  
Spring Barley ◽  
Residual Effects ◽  
Wheat Grain ◽  
K Uptake ◽  
Arable Crops ◽  
Soil P ◽  
K Fertilizer ◽  
K Depletion

SUMMARYAn experiment at Rothamsted during 1958–67 measured effects on yield, on K uptake and on soil K of applying all combinations of 38, 75 and 113 kg N and 0, 31 and 62 kg K/ha per cut to grass leys, which were cut and removed. Soil K was depleted most where most N and least K were given. Annual applications of 0, 33 and 66 kg P/ha were also tested; soil P was not depleted. The grass was then ploughed.In 1968, residual effects were measured by spring wheat. In 1969 and in 1970 104 kg/ha of fresh K was applied on half of each plot; potatoes (1969) and spring wheat (1970) valued residual and fresh effects of K.In 1971 potatoes tested 0, 104 and 208 kg/ha of fresh K, cumulatively with the three amounts given to the grass and also extra K (104 kg/ha) on half-plots, cumulatively with that given in 1969 and 1970. In 1972 winter wheat, and in 1974 and 1975 spring barley, measured residues of all treatments previously applied (the site was fallowed in 1973).Finally, in 1976, potatoes tested 0, 156 and 312 kg/ha of fresh K on whole plots, cumulatively with the previous dressings of K, and also 156 kg/ha of extra K on half-plots, again cumulatively. All these test crops were given basal N.Yields and K contents of wheat at ear emergence and yields of wheat grain were largest after grass given 38 kg N and 62 kg K/ha per cut, because here soil K depletion was least. Wheat grain yields benefited consistently from fresh K. K content of the wheat at ear emergence was a good indicator of the need for K, but K content of grain was not, because it was unaltered by K fertilizer. Barley was a poor test crop for K, because yields of grain were little affected by previous treatments.Percentage K in potato leaves (in July in 1969 and 1971, in August in 1976) and yield of tubers were well correlated. Largest yields in 1969, 1971 and 1976 came where the leaves contained 3·43, 3·76 and 2·82% K, respectively, i.e. from soil containing most exchangeable K, plus most fresh K. There was no indication that maximum yields had been obtained, so the largest amounts (kg/ha) of fresh K tested (104 in 1969, 312 in 1971 and 468 in 1976) were insufficient to counteract depletion of soil K by the grass. Because the grass did not deplete soil P, the test crops benefited only little from either residual or fresh P.

scholarly journals Phytoplankton community structure in Menjer Lake, Central Java

2021 ◽  
Vol 869 (1) ◽  
pp. 012037
Author(s):  
F Sulawesty ◽  
G P Yoga ◽  
L Subehi ◽  
R Rosidah
Keyword(s):  
Community Structure ◽  
Phytoplankton Community ◽  
Diversity Index ◽  
Nutrient Content ◽  
Cell Counting ◽  
Phytoplankton Community Structure ◽  
Nitrogen And Phosphorus ◽  
Central Java ◽  
Phytoplankton Communities ◽  
Ecological Pressure

Abstract The occurrence of land changes around Lake Menjer, Central Java Province will affect the condition of water quality subsequently will affect biota, including phytoplankton. The purposes of study was to analyze the composition and abundance of phytoplankton in Menjer Lake regarding to nutrient content i.e. nitrogen and phosphorus. Observations on the phytoplankton community were conducted in July and October 2019 at six locations in Menjer Lake. Water samples were taken at the water surface as much as 10 L filtered using plankton net. Identification was carried out under the inverted microscope Diaphot 300. The abundance was calculated using the Sedgwick Rafter cell counting (SRCC) method. Analysis of the phytoplankton community structure was derived by calculating the Diversity Index, Evenness Index, and Simpson Dominance Index. The nutrient content in Menjer Lake influences the structure of phytoplankton communities quantitatively and qualitatively. Observation showed that the diversity of phytoplankton was low and there was one species dominanted, the result explained that the phytoplankton community in Menjer Lake is unstable and there is ecological pressure on the community. It can be concluded that the improvement of environmental conditions around Menjer Lake is the basis for the sustainable management of Menjer Lake.

scholarly journals Sensitivity of quinoa cv. ‘Titicaca’ to low salinity conditions

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
María del Carmen Rodríguez-Hernández ◽  
Luna Morcillo ◽  
Idoia Garmendia
Keyword(s):  
Photosynthetic Rate ◽  
Chenopodium Quinoa ◽  
Dry Weight ◽  
Nutrient Content ◽  
Progressive Increase ◽  
Shoot Biomass ◽  
High Concentration ◽  
Negative Effects ◽  
Leaf Production ◽  
Moderate Salinity

Abstract Quinoa (Chenopodium quinoa Will.) is an annual herbaceous Andean plant. In recent years there is a growing interest on it due to its high quality as food, its wide adaptation to agroecological conditions and resistance to different abiotic stresses. In this work, we evaluate the growth pattern of quinoa plants cv. ‘Titicaca’, subjected to different levels of salinity, focusing on leaf production and nutrient content. In this sense, the results have shown that a high concentration of salinity negatively affects the growth of quinoa plants. In fact, plants grown with 200 mM NaCl reduced the photosynthetic rate and levels of chlorophylls and carotenoids in comparison with the rest of the treatments. Likewise, it has been proven how the progressive increase in salinity has negative effects on transpiration, stomatal conductance and photosynthetic rate, with significant subsequent reductions in shoot biomass, leaf area and nutrient adquisition, but without a decline in leaf dry weight (DW) production. However, the treatment of 200 mM NaCl demonstrated the best results regarding the water-use efficiency, as well as the number of saline glands. According to our results, the quinoa plant cv. ‘Titicaca’ seems to be tolerant to moderate concentrations of salinity (50–100 mM NaCl). This study could serve as a reference on this little known and cultivated species in the Mediterranean region, since it could become an alternative crop in areas with moderate salinity problems.

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