scholarly journals Effect of Plot Size on Accuracy of Yield Estimation of Rainfed Lowland Rice Genotypes with Different Plant Heights and Grown under Different Soil Fertility Conditions

2003 ◽  
Vol 6 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Suwat Jearakongman ◽  
Somdej Immark ◽  
Apichart Noenplub ◽  
Shu Fukai ◽  
Mark Cooper
Keyword(s):  
Soil Fertility ◽  
Lowland Rice ◽  
Yield Estimation ◽  
Plot Size ◽  
Rainfed Lowland ◽  
Rice Genotypes

scholarly journals Performance of Rainfed Lowland Rice Genotypes under Different Levels of Boron Application

2017 ◽  
Vol 13 (1) ◽  
pp. 28-34
Author(s):  
Ram Kumar Shrestha ◽  
Sita Paudel ◽  
Samjhana Wagle ◽  
Salikram Ghimire ◽  
Deepak Yadav
Keyword(s):  
Lowland Rice ◽  
Rainfed Lowland ◽  
Rice Genotypes ◽  
Different Levels

Genetic Diversity of Rice vampireweed (Rhamphicarpa fistulosa) Populations in Rainfed Lowland Rice in West Africa

Weed Science ◽  
2016 ◽  
Vol 64 (3) ◽  
pp. 430-440
Author(s):  
Norliette Zossou ◽  
Hubert Adoukonèou-Sagbadja ◽  
Daniel Fonceka ◽  
Lamine Baba-Moussa ◽  
Mbaye Sall ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Differentiation ◽  
Lowland Rice ◽  
Rice Grain ◽  
High Genetic Diversity ◽  
Genetic Groups ◽  
Rainfed Lowland ◽  
Rice Genotypes ◽  
The Relationship ◽  
Aflp Technique

Rice vampireweed belongs to the Orobanchaceae and is found in Africa and Australia. It is a hemiparasitic weed of lowland rice genotypes and causes losses of 40 to 100% of rice grain yield. Our study addressed the genetic diversity of rice vampireweed in Benin and Senegal. The specific objectives of this research were to study the genetic diversity of rice vampireweed accessions in Benin and Senegal and the relationship between the different genotypes of rice vampireweed through agroecological areas. To achieve these objectives, the genetic diversity of rice vampireweed accessions using the AFLP technique was studied. Based on our results, dendrogram classification has distinguished four different genetic groups. The populations of Benin and Senegal are genetically diverse. Substantial genetic differentiation (GST) exists among agroecological areas within Benin and Senegal (GST = 0.17). The high genetic diversity of rice vampireweed in Benin and Senegal presents a challenge for the development of resistant rice germplasm.

Genetic diversity in rainfed lowland rice genotypes as detected by RAPD primers

2008 ◽  
pp. 200-203
Author(s):  
S. Singh ◽  
S. Sarkarung ◽  
R. K. Singh ◽  
O. N. Singh ◽  
A. K. Singh ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Lowland Rice ◽  
Rainfed Lowland ◽  
Rice Genotypes

EVALUATION OF ON-FARM SOIL FERTILITY RESEARCH IN THE RAINFED LOWLAND RICE FIELDS OF SUKUMALAND, TANZANIA

2003 ◽  
Vol 39 (1) ◽  
pp. 65-79 ◽  
Author(s):  
H. C. C. MEERTENS ◽  
G. J. KAJIRU ◽  
L. J. NDEGE ◽  
H. J. ENSERINK ◽  
J. BROUWER
Keyword(s):  
Soil Fertility ◽  
Phosphorus Deficiency ◽  
Rice Fields ◽  
Lowland Rice ◽  
High Dose ◽  
Research Approach ◽  
Field Environment ◽  
Rainfed Lowland ◽  
Rice Yields ◽  
On Farm

The first ever on-farm soil fertility research in the rainfed lowland rice (Oryza sativa) fields of Sukumaland, in northwest Tanzania, was carried out between 1990 and 1996 in response to farmers' complaints about declining rice yields. From diagnosis to extension, the research approach followed that of the International Maize and Wheat Improvement Center (CIMMYT). In 1990/91, rice yields in the Maswa district increased sharply when nitrogen at a rate of 30 kg ha−1 in the form of urea was broadcast in flooded rice fields at tillering. Similar research was subsequently conducted in other parts of Sukumaland to evaluate this type of low-dose nitrogen application under varying circumstances. In 1995/96, higher doses of nitrogen (60 and 120 kg ha−1) and a high dose of phosphorus (17.5 kg ha−1) were applied for comparison in Sengerema district. Between 1990 and 1996, the average increase in rice yield from the application of 30 kg N ha−1 varied between 463 and 986 kg ha−1. In 1995/96, the same application of N was more economical than both 60 and 120 kg N ha−1, and no phosphorus deficiency was found. The deteriorating ratio between the price of rice at the farm gate and that of urea, however, threatens the adoption of this technology by farmers. Adaptability analysis showed that the relatively small differences in response per field (environment) in all years did not justify a need for multiple different extension messages. Until more detailed recommendations can be made, therefore, a single dose of 30 kg N ha−1, in the form of urea, applied to rice at tillering is recommended for the whole of Sukumaland to reverse the decline in yields. Further on-farm research should concentrate on improving the efficiency of nitrogen fertilization and on determining the optimum rates of other major nutrients to refine this initial recommendation.

Assessment of genetic diversity of rainfed lowland rice genotypes using microsatellite markers

2013 ◽  
Vol 73 (2) ◽  
pp. 142
Author(s):  
L. Behera ◽  
S. Mohanty ◽  
S. K. Pradhan ◽  
S. Singh ◽  
O. N. Singh ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Microsatellite Markers ◽  
Lowland Rice ◽  
Rainfed Lowland ◽  
Rice Genotypes

scholarly journals Productivity and soil fertility of rainfed lowland rice (Oryza sativa) as influenced by establishment and weed management

2020 ◽  
pp. 432-436
Author(s):  
KEVIZHALHOU KUOTSU
Keyword(s):  
Soil Fertility ◽  
Nutrient Uptake ◽  
Weed Management ◽  
Field Experiments ◽  
Lowland Rice ◽  
System Of Rice Intensification ◽  
Residual Soil ◽  
Nutrient Depletion ◽  
Rainfed Lowland ◽  
Hand Weeding

Field experiments were conducted during kharif season of 2016 and 2017 at the experimental farm of SASRD, Nagaland University, Medziphema to evaluate the effect of establishment methods and weed management on productivity, nutrient uptake, nutrient harvest index (NHI) and residual soil fertility of rainfed lowland rice. Three establishment techniques and six weed management practices were evaluated in split plot design with three replications. Results revealed higher grain (4.24 t ha-1) and straw (5.88 t ha-1) yield, nutrient uptake by grain (53.1, 13.8 and 10.7 kg NPK ha-1) and straw (32.3, 6.2 and 48.8 kg NPK ha-1); available nutrients in post harvest soil (332.5, 20.7 and 12.3 kg NPK ha-1) under system of rice intensification (SRI) whereas conventionally transplanted rice (CTR) recorded least values. Minimum weed dry matter (158.4 g m-2) and nutrient depletion (11.3, 1.9 and 19.9 kg NPK ha-1) was recorded in integrated crop management (ICM) while maximum was observed in SRI. Among the weed management methods, significantly lower weed dry weight (103.4 g m-2), nutrient depletion (7.4, 1.3 and 12.9 kg NPK ha-1) and higher grain (4.59 t ha-1) and straw (6.30 t ha-1) yield was observed under hand weeding (HW) twice at 20 and 40 days after transplanting (DAT). Nutrient depletion by grasses was observed to be higher as compared to sedges and broad leaved weeds. Weed control increased nutrient uptake by rice and decreased nutrient uptake by weeds. Hand weeding at 20 and 40 DAT recorded highest grain yield which was 81% higher over weedy check.

scholarly journals Pengelolaan Hara Terpadu pada Lahan Sawah Tadah Hujan sebagai Upaya Peningkatan Produksi Beras Nasional

2020 ◽  
Vol 14 (1) ◽  
pp. 15
Author(s):  
Antonius Kasno ◽  
Diah Setyorini ◽  
I Wayan Suastika
Keyword(s):  
Soil Fertility ◽  
Total Content ◽  
Fertilizer Application ◽  
Rice Production ◽  
Rice Fields ◽  
Lowland Rice ◽  
Limiting Factors ◽  
Rainfed Rice ◽  
Balanced Fertilization ◽  
Rainfed Lowland

<p><strong>Abstrak</strong>. Beras merupakan makanan pokok bagi bangsa Indonesia dan strategis bagi keamanan pangan nasional. Produksi beras dapat ditingkatkan melalui ektensifikasi lahan, peningkatan mutu intensifikasi dan indeks pertanaman padi. Lahan sawah tadah hujan berpotensi besar untuk menjadi lahan pertanian produktif jika tingkat kesuburan tanahnya ditingkatkan melalui penerapkan pemupukan berimbang sesuai karakteristik tanahnya. Lahan sawah non irigasi seluas 3,30 juta ha, salah satunya adalah sawah tadah hujan. Pengembangan lahan sawah tadah hujan menjadi sangat relavan dengan peningkatan kebutuhan pangan nasional. Makalah ini bertujuan untuk menelaah pengelolaan lahan sawah tadah hujan untuk meningkatkan produksi padi nasional. Faktor pembatas yang sering dihadapi antara lain ketersediaan air hujan yang sulit diprediksi serta kesuburan tanah yang rendah akibat kandungan C-organik dan N-total yang rendah. Kegagalan panen dapat terjadi akibat akibat kekurangan air pada awal tanam musim hujan maupun saat menjelang panen pada musim kedua. Perbaikannya dapat dilakukan dengan tanam gogo rancah pada musim tanam pertama, dan sistem culik pada musim tanam ke dua. Pemberian bahan pembenah tanah seperti kompos jerami, pupuk kandang, <em>biochar</em> dan kapur pertanian/dolomit terutama untuk tanah yang bereaksi masam ditujukan untuk meningkatkan kesuburan tanah sebelum dilakukan pemupukan. Teknologi pemupukan berimbang yang dapat diterapkan pada lahan sawah tadah hujan, antara lain Urea 250-300 kg ha<sup>-1</sup>, SP-36 50-75 kg ha<sup>-1</sup>, dan KCl 50 kg ha<sup>-1</sup>, pemberian bahan organik minimal 2 t ha<sup>-1</sup>, serta pengembalian jerami sisa hasil panen ke dalam tanah. Pemupukan berimbang dapat meningkatkan hasil padi dari 1,8-3,5 t ha<sup>-1 </sup>menjadi 5,0-5,8 t ha<sup>-1</sup>.</p><p> </p><p><strong>Abstract</strong>. Rice is a staple food for the Indonesian people and a strategic comodity for national food security. Rice production can be increased through land extensification, improved quality of intensification and rice cropping index. Rainfed lowland rice fields could be very potentially productive for agriculture  when the level of soil fertility is improved by applying balanced fertilization that based on the soil characteristics. Non-irrigated rice field area is 3.30 million ha, including the rainfed rice fields. The development of rainfed rice fields is very relevant to the increasing national food needs. The goal of this paper is to examine the management of rainfed lowland rice fields to increase the national rice production. Some of the limiting factors are the unpredictable rainwater availability and low soil fertility due to low C-organic and N-total content. Harvesting failures could be caused by water stress at the beginning of the planting stage in the rainy season or just before harvesting in the second season. This could be prevented by planting upland scaffolding in the first planting season, and the kidnap system in the second growing season. The application of soil enhancers is intended to increase soil fertility before fertilizer application, such as straw compost, manure, biochar and agricultural lime or dolomite especially for acidic soils. Balanced fertilization technology that can be applied to rainfed lowland rice fields are Urea 250-300 kg ha<sup>-1</sup>, SP-36 50-75 kg ha<sup>-1</sup>, and KCl 50 kg ha<sup>-1</sup>, providing organic material at least 2 t ha<sup>-1</sup>, and the return of the remaining crop straw to the ground. Balanced fertilization can increase rice yield from 1.8-3.5 t ha<sup>-1</sup> to 5.0-5.8 t ha<sup>-1</sup>.</p>

scholarly journals Genotypic Variation in Response of Rainfed Lowland Rice to Prolonged Drought and Rewatering

2004 ◽  
Vol 7 (4) ◽  
pp. 406-420 ◽  
Author(s):  
Akihiko Kamoshita ◽  
Reynaldo Rodriguez ◽  
Akira Yamauchi ◽  
Len Wade
Keyword(s):  
Genotypic Variation ◽  
Lowland Rice ◽  
Rainfed Lowland ◽  
Prolonged Drought
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