scholarly journals VARIABILIDADE ESPACIAL DA UMIDADE DO SOLO EM IRRIGAÇÃO POR GOTEJAMENTO SOB CULTIVO PROTEGIDO

Irriga ◽  
2002 ◽  
Vol 7 (3) ◽  
pp. 201-213
Author(s):  
Ivana Furio Batista ◽  
Célia Regina Lopes Zimback ◽  
Juliana Aguiar Vettorato
Keyword(s):  
Soil Moisture ◽  
Spatial Variability ◽  
Drip Irrigation ◽  
Spatial Dependence ◽  
Water Distribution ◽  
Irrigation System ◽  
Drip Irrigation System ◽  
Magnitude Range ◽  
Experimental Variogram ◽  
E Mail

VARIABILIDADE ESPACIAL DA UMIDADE DO SOLO EM IRRIGAÇÃO POR GOTEJAMENTO SOB CULTIVO PROTEGIDO[1]   Ivana Fúrio BatistaCélia Regina Lopes ZimbackJuliana Aguiar VettoratoDepartamento de Recursos Naturais, Faculdade de Ciências Agronômicas, Universidade Estadual Paulista, Botucatu, CP 237, CEP 18603-970. E-mail: [email protected]    1 RESUMO              Foi estudada a variabilidade espacial da umidade do solo num sistema de irrigação por gotejamento em uma estufa (5,0 x 20,0m) na Fazenda Experimental São Manuel, da Faculdade de Ciências Agronômicas, Universidade Estadual Paulista, Estado de São Paulo, Brasil. Foi estabelecida a malha de amostragem no espaçamento de 1,0 x 0,5m, acrescida de quatro adensamentos de 0,25m. Foram utilizados dados da umidade do solo em 178 pontos. A análise da dependência espacial foi obtida com o auxílio do Programa GS+. Foi construído o variograma experimental e definido o modelo de ajuste, de modo que a curva que melhor se ajustou aos pontos obtidos representasse a magnitude, alcance e intensidade da variabilidade espacial da variável estudada. A umidade do solo apresentou distribuição espacial anisotrópica. Para a direção 0°, pode-se notar uma dependência espacial caracterizada como alta, com o alcance de aproximadamente 3,30m, no sentido do comprimento da estufa. Entretanto, no sentido da largura da estufa, não foi possível ajustar modelos. Utilizando a representação gráfica da superfície, a área estudada apresentou um maior teor de água na parte inicial e menor na parte final das linhas de distribuição de água. A krigagem mostrou-se um bom interpolador para mapeamento da umidade do solo.  UNITERMOS: geoestatística, dependência espacial, umidade do solo, irrigação por gotejamento, cultivo protegido.   BATISTA, I.F.; ZIMBACK, C.R.L.; VETTORATO, J.A.  SPATIAL VARIABILITY OF SOIL MOISTURE IN A DRIP IRRIGATION SYSTEM UNDER GREENHOUSE   2 ABSTRACT             Soil moisture spatial variability in a drip irrigation system was studied in a greenhouse (5.0 x 20.0m) at São Manuel Experimental Farm, FCA/UNESP, Botucatu – SP, Brazil. Sampling was established in a 1.0 x 0.5m grid, increased 0.25m thickening. Soil moisture data were used in 178 points. The spatial dependence analysis was obtained with the aid of the GS+ Program. The experimental variogram was built and the setting model defined, so that the curve better fitted to the obtained points represented the spatial variability magnitude, range and intensity of the studied variable. Soil moisture presented anisotropic spatial distribution. Spatial dependence was noticed for 0° direction, characterized as high, with approximately 3.30m range in the greenhouse length ward. However, in the greenhouse width ward, it was not possible to fit models. Using the surface graphic representation, the studied area presented higher water content in the initial part and a lower one in the final part of water distribution lines. Kriging was shown to be a good interpolator for soil moisture mapping.  KEYWORDS: geostatistics, spatial dependence, soil moisture, drip irrigation, greenhouse.

Analyzing Soil Moisture Uniformity for Surface Drip Irrigation System in Multi-layered soil

2011 ◽  
Author(s):  
Soon Goon Choi ◽  
Jin-Yong Choi ◽  
Won-Ho Nam ◽  
Eun Mi Hong ◽  
Sang-Ho Jeon
Keyword(s):  
Soil Moisture ◽  
Drip Irrigation ◽  
Irrigation System ◽  
Layered Soil ◽  
Drip Irrigation System ◽  
Surface Drip Irrigation

scholarly journals Evaluation of Uniformity Coefficient and Soil Moisture Distribution under Drip Irrigation System

2019 ◽  
pp. 1-9
Author(s):  
A. Selvaperumal ◽  
E. Sujitha ◽  
I. Muthuchamy
Keyword(s):  
Soil Moisture ◽  
Drip Irrigation ◽  
Goodness Of Fit ◽  
Irrigation System ◽  
Block Design ◽  
Moisture Distribution ◽  
Drip Irrigation System ◽  
Uniformity Coefficient ◽  
Rate Of Increase ◽  
Soil Moisture Distribution

Drip irrigation system uniformity can preserve a higher crop yield and deplete the initial investment of cost. The experiment was conducted at precision farming development centre research farm, Tamil Nadu Agricultural University, Coimbatore, to evaluate the uniformity coefficient and soil moisture distribution under drip irrigation system. The experiment was designed under Factorial Randomized Block Design (FRBD) which included three fertigation levels 80%, 100% and 120% of Recommended Dose of fertilizers which were replicated thrice. The Coefficient of Variation (CV) was obtained as 0.0207 per cent kept at a constant pressure of 50.66 kPa, Statistical Uniformity (SU) as 97 per cent and Coefficient of Uniformity (CU) as 0.9518. As the elapsed time increased, the rate of increase of wetted zone diameter decreased. A high R2 value of 0.97 shows the goodness of fit for the horizontal movement. The mean soil moisture distribution 39.2 per cent was observed below the emitter at the depth of 10 cm immediately after irrigation.

scholarly journals Head and lateral length on water distribution uniformity of a PVC drip irrigation system

2014 ◽  
Vol 9 (30) ◽  
pp. 2298-2305 ◽  
Author(s):  
Evans ASENSO ◽  
Jiuhao LI ◽  
Hai-Bo CHEN ◽  
Emmanuel OFORI ◽  
Fuseini ISSAKA ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Water Distribution ◽  
Irrigation System ◽  
Drip Irrigation System ◽  
Distribution Uniformity ◽  
Lateral Length

scholarly journals Kajian Aplikasi Alat Penyiraman Otomatis dengan Sistem Irigasi Tetes Berbasis Perubahan Kadar Air Tanah pada Tanaman Pakcoy (Brassica chinensis L.)

2017 ◽  
Vol 2 (3) ◽  
pp. 294-307
Author(s):  
Khairunnisak Khairunnisak ◽  
Devianti Devianti ◽  
Mustafril Mustafril
Keyword(s):  
Soil Moisture ◽  
Control System ◽  
Drip Irrigation ◽  
Irrigation System ◽  
Coefficient Of Determination ◽  
Drip Irrigation System ◽  
Brassica Chinensis ◽  
Close Relationship ◽  
Irrigation Control ◽  
Banda Aceh

Abstrak. Pemberian air irigasi secara berlebihan yang tidak sesuai dengan kebutuhan air tanaman akan mempengaruhi pertumbuhan dan produksi tanaman. Salah satu model irigasi yang memungkinkan untuk mengatur jumlah air sesuai dengan kebutuhan tanaman adalah sistem irigasi tetes. Penjadwalan irigasi secara otomatis sangat mendukung disaat cuaca yang susah diprediksi akibat adanya perubahan iklim global. Tujuan penelitian ini adalah untuk menguji kinerja mikrokontroler pada sistem irigasi tetes yang mampu bekerja secara otomatis berdasarkan perubahan kadar air tanah pada tanaman pakcoy. Penelitian  ini dilakukan di desa Lambhuk, Kecamatan Ulee Kareng, Kota Banda Aceh dengan ketinggian lahan 3,8 m di atas permukaan laut dengan ordo tanah regosol. Metode penilitian yang digunakan adalah tahap persiapan yaitu pengambilan sampel tanah untuk dianalisis di laboratorium, pembuatan jaringan sistem irigasi tetes, persemaian benih pakcoy, persiapan media tanam sebanyak 8 pot tanam, pengkalibrasian sensor kelembaban tanah, persiapan bibit pakcoy serta penanaman, dan pemasangan sistem kontrol irigasi tetes otomatis. Tahap pengamatan yaitu diukur tinggi dan jumlah helai daun pakcoy, dan ditimbang bobot segar pakcoy. Hasil penelitian menunjukkan bahwa sistem kontrol irigasi tetes otomatis dapat memenuhi kebutuhan air tanaman pakcoy berdasarkan penentuan kadar air tanah pada keadaan air tersedia, dengan koefisien determinasi (R2) sebesar 0,687. Kinerja alat penyiraman otomatis dengan menggunakan mikrokontroler dapat berfungsi dengan baik dalam memberikan air ke tanaman sesuai dengan yang diinginkan, hal ini dapat dilihat dari kemampuan alat merespon perubahan kadar air tanah menyebabkan katup terbuka dan tertutup sesuai dengan setpoint yang telah ditentukan. Terdapat hubungan yang erat antara perubahan kadar air tanah terhadap pertumbuhan pakcoy dengan koefisien determinasi (R2) sebesar 0,92 dan 0,799, dan terdapat hubungan yang erat antara pemberian air dengan sistem irigasi tetes otomatis terhadap pertumbuhan pakcoy dengan koefisien determinasi (R2) sebesar 0,778 dan 0,696. Sistem irigasi tetes otomatis dapat mengurangi pemborosan air irigasi.Study of Application of Automatic Watering Equipment with Drip Irrigation System Based on Changes in Groundwater Level on Pakcoy (Brassica chinensis L.Abstract. Excessive administration of irrigation water that is inconsistent with crop water requirements will affect plant growth and production. One of the irrigation models that allows to regulate the amount of water in accordance with the needs of the plant is the drip irrigation system. Irrigation scheduling automatically is very supportive when the weather is difficult to predict due to global climate change. The purpose of this research is to test the performance of microcontroller in drip irrigation system that can work automatically based on changes in soil moisture content in pakcoy plant. This research was conducted in Lambhuk village, Ulee Kareng sub-district, Banda Aceh city with land height 3,8 m above sea level with regosol land order. The research method used is the preparation phase of soil sampling to be analyzed in the laboratory, the making of drip irrigation system network, the seedbed of pakcoy seed, the preparation of planting media of 8 planting pots, the calibration of soil moisture sensor, the preparation of pakcoy seeds as well as the planting and installation of the irrigation control system Auto drops. Observation phase is measured height and number of leaf of pakcoy leaf, and weighs fresh weight of pakcoy. The result of research indicates that automatic drip irrigation control system can fulfill the water requirement of pakcoy plant based on the determination of ground water level in available water condition, with coefficient of determination (R2) equal to 0,687 . The use of automatic drip irrigation control system has an effect on the growth and production of pakcoy. There is a close relationship between soil moisture change to the growth of pakcoy with coefficient of determination (R2) of 0.92 and 0.799, and there is a close relationship between water delivery with automatic drip irrigation system to the growth of pakcoy with coefficient of determination (R2) of 0.778 and 0.696.

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