scholarly journals New instruments for agricultural research.

1954 ◽  
Vol 2 (3) ◽  
pp. 209-214
Author(s):  
H.A.C. Thijssen ◽  
C.T. De Wit ◽  
E. Van Vollenhoven ◽  
H.J. Timmers ◽  
L. Admiraal
Keyword(s):  
Soil Moisture ◽  
Soil Temperature ◽  
Agricultural Research ◽  
Rapid Determination ◽  
Resistance Bridge ◽  
Level Recorder ◽  
Water Level Recorder ◽  
New Instruments ◽  
Soil And Water

The following instruments have been developed and are briefly described: (a) mechanical ground-water-level recorder, (b) a resistance bridge for measuring soil- and water-salinity, soil moisture and soil temperature, (c) oscillating micropsychro-meter, (d) field apparatus for rapid determination of soil moisture.-W.J.B. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Thermal and Soil Moisture Amplitude of Intercropped Crops

2020 ◽  
pp. 1-13
Author(s):  
João Danilo Barbieri ◽  
Paulo Sérgio Lourenço de Freitas ◽  
Rivanildo Dallacort ◽  
Cornélio Alberto Zolin ◽  
Diego Fernando Daniel ◽  
...  
Keyword(s):  
Zea Mays ◽  
Soil Moisture ◽  
Soil Temperature ◽  
Zea Mays L ◽  
Dry Mass ◽  
Development Stage ◽  
Grain Production ◽  
Lower Amplitude ◽  
Thermal Amplitude ◽  
Soil And Water

Conservation systems of production are promoting yields and profitability, intercropping systems aim at sustainable maximization of soil and water use, and have become an alternative for regions characterized by relatively short rainy periods and high temperatures. The objective of this work was to evaluate the influence of the intercropping system between maize (Zea mays L.) and C. juncea (Crotalaria juncea L.) on soil temperature and humidity for the municipality of Tangará da Serra in Brazil. The treatments consisted of the single crop of maize and crotalaria, as well as their intercrop cultivation, the soil temperature was evaluated at depths of 0.10, 0.20, 0.30 and 0.40 m and soil moisture at depths of 0.20 and 0.40 m. The components of grain production and yield of maize were also evaluated, for crotalaria, height, diameter and dry mass of the plants were evaluated. The highest soil temperature occurred at 14 h with an average of 21°C for all three treatments. The intercropping of maize with crotalaria gave the soil a lower amplitude of the soil temperature and kept the soil moisture high with values of 0.3 m3 m-3 in the depth of 0.20 m. The development stage presented the lowest mean thermal amplitude and higher humidity for the intercrop system. The yield of maize in an intercrop was reduced by 42.7% compared to a single crop.

RAPID DETERMINATION OF SOIL MOISTURE BY ALCOHOL

Science ◽  
1927 ◽  
Vol 65 (1685) ◽  
pp. 375-376
Author(s):  
G. J. Bouyoucos
Keyword(s):  
Soil Moisture ◽  
Rapid Determination

scholarly journals EFFECT OF MULCH ON SOIL TEMPERATURE, SOIL MOISTURE CONSERVATION AND YIELD OF CHILLI

2020 ◽  
Vol 4 (1) ◽  
pp. 36-39
Author(s):  
M. Yasmin ◽  
M.A. Rahman ◽  
F.S. Shikha ◽  
M.S. Rahman ◽  
J. Rahman ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Soil Temperature ◽  
Rice Straw ◽  
Agricultural Research ◽  
Research Station ◽  
Gross Margin ◽  
Yield Attributes ◽  
Straw Mulch ◽  
Soil Moisture Conservation ◽  
Polyethylene Mulch

The experiment was conducted at Regional Agricultural Research Station (RARS), Jamalpur, Bangladesh during the period of 2017-18 and 2018-19 with the objectives to evaluate the effect of different mulch on soil temperature, soil moisture conservation and yield attributes of chilli. There were five treatments comprising T1: no mulch, T2: rice straw mulch @ 5 t ha-1, T3: water hyacinth mulch @ 5 t ha-1, T4: black polyethylene mulch and T5: white polyethylene mulch. The results revealed that, all the mulch treatment had higher soil temperature and soil moisture content at 5 cm and 10 cm depth compared to no mulch treatment. Soil temperature was highest in black polyethylene mulch, it increased average soil temperature by about 5.7 oC at 5 cm depth and 5.1 oC at 10 cm depth compared to no mulch treatment at 120 Days. Rice straw mulch treatment recorded highest soil moisture, it increased average soil moisture about 27.87 % at 5 cm depth and 28.57% at 10 cm depth over no mulch treatment. Rice straw mulch treatment produced highest green chilli yield (8.81 t ha-1) which was 26.94 % increased over no mulch treatment (6.94 t ha-1).Considering economic analysis, highest gross return (Tk 352400 ha-1), gross margin (Tk 235400 ha-1) and BCR (3.01) was obtained from same treatment T2 i.e., rice straw mulch treatment.

scholarly journals Implikasi Pemberian Lubang Resapan Biopori Terhadap Laju Infiltrasi Pada Lahan Perkebunan Kelapa Sawit (Elaeis guineensis)

2018 ◽  
Vol 3 (2) ◽  
pp. 361-370
Author(s):  
Nurul Syahputri Sulaiman ◽  
Devianti Devianti ◽  
Syahrul Syahrul
Keyword(s):  
Organic Matter ◽  
Soil Moisture ◽  
Water Level ◽  
Palm Oil ◽  
Elaeis Guineensis ◽  
Infiltration Rate ◽  
Moisture Contents ◽  
Initial Soil ◽  
Level Recorder ◽  
Water Level Recorder

Abstrak. Laju infiltrasi dipengaruhi oleh kondisi fisik tanah seperti tekstur dan kandungan bahan organik serta vegetasi yang berada pada permukaan tanah yang dicirikan oleh tipologi perakarannya. Tanaman kelapa sawit merupakan tanaman berakar serabut, dan juga menghasilkan tandan kosong yang dapat digunakan sebagai pupuk organik yang mampu menyerap air dalam jumlah relatif lebih tinggi. Penelitian ini bertujuan untuk mengetahui implikasi pemberian lubang resapan biopori terhadap laju infiltrasi pada lahan perkebunan kelapa sawit (Elaeis guineensis). Penelitian ini dilakukan dengan cara pengamatan dan pengukuran secara langsung laju infiltrasi untuk perlakuan lubang resapan biopori denganTKKS (plot TB) dan tanpa TKKS (plot B) selama 2 minggu. Pengukuran laju infiltrasi menggunakan AWLR (Automatic Water Level Recorder) dan software Global Logger v 1.50. Diameter lubang 6 inci dengan kedalaman tiap lubang yaitu 100 cm. Pengukuran laju infiltrasi pada lubang resapan biopori dilakukan dengan mengisi air pada lubang sampai konstan dengan tinggi muka air 98 cm. Hasil pengukuran menunjukkan terdapat perbedaan laju infiltrasi yang signifikan antara lubang resapan biopori tanpa TKKS dan dengan TKKS. Selama pengukuran bahan organik tanah mengalami peningkatan di lubang dengan TKKS dari sebesar 1,32% menjadi 3,26 %. Laju infiltrasi yang tertinggi pada lubang resapan biopori dengan TKKS besar 1,78 cm/menit dengan kadar air tanah awal 31,47%  serta akumulasi 5,12 cm, sedangkan yang terendah yaitu sebesar 0,21 cm/menit dengan kadar air tanah awal 31,59% serta akumulasi yang diperoleh sebesar 1,18 cm. Hal ini membuktikan terjadi peningkatan laju infiltrasi sebesar 0,93 cm/menit. Hasil laju infiltrasi yang diperoleh yaitu plot TB menghasilkan persamaan laju infiltrasi f = 0,665t-0,024. Sama halnya plot B menghasilkan persamaan laju infiltrasi f = 0,572t-0,0011 dan f = 0,776t-0,016.Implications Of Granting Biopore Infiltration Hole Against The Rate Of Infiltration In The Oil Palm Plantation(Elaeis guineensis)Abstract. The rate of infiltration is influenced by soil physical conditions including texture, organic matter and vegetation on the soil surface characterized by its root typology. Palm oil is rooted fiber plant, also produce empty bunches that can be used as an organic fertilizer that can absorb water in relatively high amount. The aim of this study is to discover the implication of given biopore absorption hole on the infiltrasi rate of palm oil (Elaeis guineensis) plantation land.  This study was done by observation and measurement of the infiltration rate directly for the treatment of biopore absorption hole at plot TB and plot B during two weeks period. Measurement of infiltration rate used AWLR (Automatic Water Level Recorder) and software global logger V.1.50. Diameter of hole is 6 inches and the depth of each hole is 100 cm. For measurement of infiltration rate,  biopore absorption hole is filled water until water depth of 98 cm. Measurement result shows that there is a significant difference in infiltration rate between biopore absorption hole without empty bunches and with empty bunches. From the measurement, soil organic matter in the hole with TKKS undergoes enhancement from 1,32% to 3,26%, highest infiltration rate in biopore absorption hole with TKKS is 1,78 cm/minutes with initial soil moisture contents 31,47% and accumulation of 5,12 cm, meanwhile lowest infiltration rate is 0,21 cm/minute with initial soil moisture contents 31,59%  and accumulation of 1,18 cm. The results show that is plot TB produce determination value (R2) 0,998 is f = 0,665t-0,024. Similary, plot B result is f = 0,572t-0,0011 and f = 0,776t-0,016.

Weak Beam Imaging and Diffraction Studies of Stacking Faults in Silicon

1976 ◽  
Vol 34 ◽  
pp. 590-591
Author(s):  
T. Y. Tan ◽  
W. K. Tice
Keyword(s):  
Fast Neutron ◽  
Rapid Determination ◽  
Stacking Faults ◽  
Imaging Method ◽  
Large Reduction ◽  
Dislocation Loops ◽  
Fringe Spacing ◽  
Weak Beam ◽  
Kinematical Theory

In studying ion implanted semiconductors and fast neutron irradiated metals, the need for characterizing small dislocation loops having diameters of a few hundred angstrom units usually arises. The weak beam imaging method is a powerful technique for analyzing these loops. Because of the large reduction in stacking fault (SF) fringe spacing at large sg, this method allows for a rapid determination of whether the loop is faulted, and, hence, whether it is a perfect or a Frank partial loop. This method was first used by Bicknell to image small faulted loops in boron implanted silicon. He explained the fringe spacing by kinematical theory, i.e., ≃l/(Sg) in the fault fringe in depth oscillation. The fault image contrast formation mechanism is, however, really more complicated.

Methods for rapid determination of pecan (Carya illinoensis) seed viability

2017 ◽  
Vol 45 (2) ◽  
pp. 455-464
Author(s):  
T.T. Xue ◽  
J. Liu ◽  
Y.B. Shen ◽  
G.Q. Liu
Keyword(s):  
Rapid Determination ◽  
Seed Viability ◽  
Carya Illinoensis
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