At Last, Another Record Corn Crop

Field studies were conducted to determine the nitrogen (N) fertilizer replacement value (NFRV) when soybean (Glycine max [L.] Merrill) preceded corn (Zea mays L.) in the rotation (S-C), compared to corn preceding corn (C-C). Large, replicated blocks of soybean and corn were established in 1993 and 1994 near Elora, Ontario. In the following year, each large block was subdivided into smaller plots. Fertilizer N was applied at six rates from 0 to 200 kg N ha−1 to the second-year corn crop. Corn grain yield responses to fertilizer N were fitted by quadratic regression. Maximum economic rate of N was calculated for each crop sequence and NFRV's were determined. Corn yields were consistently higher when grown after soybean (S-C) than after corn (C-C). Maximum corn yields were 10.4 and 12.3 Mg ha−1 in 1994 and 1995, respectively. NFRVs for S-C, compared to C-C, were 41 and 59 kg N ha−1 in the two years. As a result of these studies and numerous other experiments, recommended fertilizer N rates have been changed to 30 kg N ha−1 less for S-C than for C-C in central Ontario. Key words: Nitrogen credit, corn, soybean, fertilizer N, replacement value, crop rotation

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Crop rotation, green manure and nitrogen fertilizers in upland rice under no-tillage

Pesquisa Agropecuária Tropical ◽

10.1590/1983-40632018v4851446 ◽

2018 ◽

Vol 48 (2) ◽

pp. 153-162 ◽

Cited By ~ 5

Author(s):

Orivaldo Arf ◽

José Roberto Portugal ◽

Salatiér Buzetti ◽

Ricardo Antônio Ferreira Rodrigues ◽

Marco Eustáquio de Sá

Keyword(s):

Cover Crops ◽

Upland Rice ◽

Irrigation System ◽

Block Design ◽

Sprinkler Irrigation ◽

Pigeon Pea ◽

Nitrogen Fertilizers ◽

No Tillage ◽

Brazilian Savannah ◽

Corn Crop

ABSTRACT The Brazilian Savannah region presents a great potential for the expansion of upland rice crops. However, studies are necessary to identify practices that can improve the crop performance, especially in no-tillage systems. This study aimed to assess the effect of cover crops in association with corn on the development and yield of rice cultivated in rotation and cover fertilized with nitrogen doses. The sprinkler irrigation system was used and the experiment was developed in the 2014/2015 and 2016/2017 harvest years, using a randomized block design, in a 5 × 4 factorial scheme. The treatments consisted of the crop remains combinations of single corn crop, corn + Crotalaria spectabilis, corn + pigeon pea, corn + jack bean and corn + Urochloa ruziziensis, as well as cover nitrogen doses (0 kg ha-1, 40 kg ha-1, 80 kg ha-1 and 120 kg ha-1) in the rice. The cultivation of upland rice in rotation with corn + pigeon pea was favored by the greater soil cover and nitrogen supply via cycling, if compared to the rotation with single corn crop. The intercropped corn + pigeon pea cultivation in the previous summer resulted in a 15 % increase in the yield of rice grains seeded in the rotation, when compared to the single corn crop. The cover nitrogen application positively influenced the grain yield with the maximum estimated doses of 46 kg ha-1 and 105 kg ha-1 of nitrogen, respectively in the 2014/2015 and 2016/2017 harvest years.

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RESPONSE OF SENSITIVE CORN HYBRIDS TO THE ASSOCIATION OF NICOSULFURON AND TIMING OF NITROGEN APPLICATION

Revista Ciência Agrícola ◽

10.28998/rca.v17i2.6316 ◽

2019 ◽

Vol 17 (2) ◽

pp. 27

Author(s):

Heitor Franco de Sousa ◽

Paulo César Timossi ◽

Antônio Paulino da Costa Netto ◽

Claudio Hideo Martins Costa

Keyword(s):

Grain Yield ◽

Correlation Coefficients ◽

Nitrogen Fertilizers ◽

Nitrogen Application ◽

Corn Hybrids ◽

Corn Crop ◽

Coated Urea ◽

The One

Nicosulfuron is an herbicide used in corn crop for controlling weeds, some hybrids are sensitivity to nicosulfuron even more when it is applied near to the application of nitrogen fertilizers. Thus, this study aimed to evaluate the response of sensitive corn hybrids to association of urea and coated urea applied near to nicosulfuron application on V4 corn stage. P 3646 hybrid was the most sensitive, and urea and coated urea applied near to nicosulfuron had significant effect on corn growth for all hybrids. Most hybrids showed high or significant (p < 0.10) correlation coefficients for grain yield, cob length and row per ear. SYN 7341 hybrid was the one that showed better results in grain yield with urea and nicosulfuron combination. Coated urea should not be applied after V8corn stage when nicosulfuron is applied at V4.

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EFFECT OF HYBRID, PLANTING DATES AND HARVESTING DATES ON YIELD, QUALITY, AND STORABILITY OF BABY CORN CROP.

Fayoum Journal of Agricultural Research and Development ◽

10.21608/fjard.2016.191275 ◽

2016 ◽

Vol 30 (1) ◽

pp. 93-110

Author(s):

Shehata S.A. ◽

Manal M. Attia ◽

Mohamed M.E

Keyword(s):

Planting Dates ◽

Corn Crop ◽

Yield Quality

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Pengendalian Alternatif Hama Serangga Sayuran dengan Menggunakan Perangkap Kertas

Jurnal Agro ◽

10.15575/860 ◽

2016 ◽

Vol 3 (2) ◽

pp. 21-33

Author(s):

Lukmanul Hakim ◽

Erdi Surya ◽

Abdul Muis

Keyword(s):

Research Method ◽

Agricultural Development ◽

Block Design ◽

Insect Population ◽

Green Paper ◽

Experimental Field ◽

Corn Crop ◽

Yellow Color ◽

Aceh Province ◽

Insect Populations

Sayuran merupakan bahan pangan yang sangat dibutuhkan manusia karena mengandung serat dan sejumlah vitamin dan mineral. Untuk memenuhi kebutuhan masyarakat akan sayuran banyak kendala yang dihadapi petani, salah satunya adalah gangguan hama serangga. Untuk mengendalikan hama serangga telah banyak pula cara yang dilakukan oleh petani. Penelitian ini bertujuan untuk menguji model perangkap serangga yang terbuat dari media kertas dan lampu warna. Warna yang dicobakan dalam penelitian ini terdiri dari merah, kuning, dan hijau. Penelitian ini telah dilakukan dari bulan Juli sampai dengan Agustus 2016 di kebun percobaan Sekolah Menengah Kejuruan Pembangunan Pertanian (SMKPP), Kecamatan Lembah Seulawah, Kabupaten Aceh Besar, Provinsi Aceh. Objek penelitian adalah tanaman jagung. Metode penelitian menggunakan RCBD dengan 3 perlakuan dan 4 ulangan. Variabel pengamatan populasi serangga yang terperangkap pada media kertas dan lampu warna. Hasil penelitian menujukkan tangkapan serangga tertinggi pada kertas dan lampu warna kuning, kemudian diikuti kertas dan lampu warna hijau dan merah. This study aimed to test the two models of trap insect, which were made from trapping paper media and colored light. The tested colors are red, yellow, and green, while the colors of light consist of red, yellow, and green. This study conducted from July to August 2016 at the experimental field of "Hight School Vocational Agricultural Development” Seulawah Valley Districts, Large Districts of Aceh, Aceh Province using the corn crop as the object. The research method approached in Randomized Completely Block Design (RCBD) with 3 treatments and 4 replications. The variable observation was insect populations trapped on paper media and colored light. The result showed that the highest insect population was on paper and yellow color light, the medium population was on the green paper, and the lowest population encountered on red paper.

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Least limiting water range in Oxisols under different levels of machine traffic

Comunicata Scientiae ◽

10.14295/cs.v8i2.2423 ◽

2018 ◽

Vol 8 (2) ◽

pp. 337-346

Author(s):

Karina De Vares Rossetti ◽

José Frederico Centurion

Keyword(s):

Bulk Density ◽

Block Design ◽

Corn Yield ◽

Soil Penetration Resistance ◽

Corn Crop ◽

Randomized Block Design ◽

Crop Development ◽

Least Limiting Water Range ◽

Different Levels

This work aimed, to evaluate the structural behavior of Oxisols based on the least limiting water range (LLWR) and establish relations with corn crop. The experiment was carried out in a randomized block design with five treatments and four replications. Soil samples collected at the layer of 0-0.20 m depth in a Haplustox (LVd) and an Eutrustox (LVef) were used. The compaction treatments consisted of T0= no additional compaction; T1 and T2= two and four passes with a 4 t tractor, respectively; T3 and T4 = two and four passes with a 10 t tractor, respectively. The range of LLWR variation in the LVd was the lowest one and varied from 0.01 to 0.04 m3 m-3, whereas in the LVef varied from 0.03 to 0.13 m3 m-3 for the critical soil penetration resistance (PRc) of 2 MPa. It was observed that critical bulk density (BDc) values were 1.76 and 1.40 Mg m-3 in the LVd and the LVef, respectively. The highest frequency of bulk density (BC ≥ BDc) occurred from the T1 to T4 (LVd) and from the T2 to T4, however, a reduction in corn yield was not observed. The determination of the LLWR was efficient and complementary for identifying more favorable or more impeditive conditions to compaction in the LVef for the corn crop development in relation to the LVd.

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