The response to row spacing of two tropical rice varieties of contrasting plant type

1968 ◽  
Vol 8 (34) ◽  
pp. 582 ◽  
Author(s):  
PC Owen
Keyword(s):  
Grain Yield ◽  
Leaf Area ◽  
Vegetative Growth ◽  
Unit Area ◽  
Row Spacing ◽  
Northern Australia ◽  
Plant Type ◽  
Wet Season ◽  
Rice Varieties ◽  
Tropical Conditions

The growth of two rice varieties of contrasting plant type and of different origin was compared at two row spacings under wet season tropical conditions in northern Australia. The short, erect-leaved variety SML 81b responded to the closer spacing by producing fewer tillers and a smaller leaf area per plant during active vegetative growth. The tropical leafy variety Sircna did not exhibit any compensatory reduction of the growth of individual plants, and dense crop growth and high leaf area indices resulted at the closer spacing. The heavy vegetative growth of Sircna was not reflected in grain yield at harvest, while the higher tiller number per unit area of SML 81b resulted in a higher grain yield at the closer spacing. The agricultural implications of the results are discussed.

scholarly journals Row-spacing and seed-rate effects on winter wheat in Ontario

1993 ◽  
Vol 73 (1) ◽  
pp. 31-35 ◽  
Author(s):  
A. H. Teich ◽  
T. Welacky ◽  
A. Hamill ◽  
A. Smid
Keyword(s):  
Winter Wheat ◽  
Grain Yield ◽  
Key Words ◽  
Unit Area ◽  
Growth And Yield ◽  
Row Spacing ◽  
Seed Rate ◽  
Weed Growth ◽  
Rate Effects ◽  
Lamb’S Quarters

This study was carried out to determine if winter wheat in southwestern Ontario should be grown in rows narrower than the conventional 18 cm and if the current recommended seed rate of 3.2 million seeds ha−1 (msh) is adequate. We compared the effect of 10- and 20-cm row spacings and 1.6, 3.2, and 6.4 msh seed rates on grain yield, weed growth and yield of underseeded clover. Row spacing at a constant seed rate did not affect yield. With increasing seed rate there was an increase in yield, mainly through more heads per unit area, which more than compensated for a decrease in seeds per head. Narrow rows reduced the number of lamb’s-quarters and the overall weed count. The optimum seed rate for grain yield was 6.4 msh for ratios of seed cost:crop value less than 1.34. Key words: Narrow rows, weeds, yield, economic optimum

The Field Performance of Induced Uniculm Grain Sorghum (Sorghum bicolor) in South-east Queensland, Australia

1986 ◽  
Vol 22 (4) ◽  
pp. 393-403 ◽  
Author(s):  
S. Fukai ◽  
C. J. Liwa ◽  
C. W. L. Henderson ◽  
B. B. Maharjan ◽  
R. C. Hermus ◽  
...  
Keyword(s):  
Grain Yield ◽  
Leaf Area ◽  
Root Development ◽  
Dry Matter ◽  
Flag Leaf ◽  
Field Performance ◽  
Grain Sorghum ◽  
Wet Season ◽  
Stages Of Growth ◽  
Dry Conditions

SUMMARYReduction of leaf area in sorghum without tillers (uniculm sorghum) might result in conservation of water at early stages of growth and hence in stability of grain yield under dry conditions. In two experiments in south-east Queensland, Australia, tillers were removed by hand to examine the growth of uniculm sorghum. Tiller removal promoted root development at the flag leaf stage but significantly reduced shoot dry matter and lowered grain yield by about 20% in a wet season. The saving in soil water as a result of tiller removal was relatively small but statistically significant.

Influence of row spacing on water use and yield of rain-fed wheat (Triticum aestivum L.) in a no-till system with stubble retention

2010 ◽  
Vol 61 (11) ◽  
pp. 892 ◽  
Author(s):  
S. G. L. Kleemann ◽  
G. S. Gill
Keyword(s):  
Grain Yield ◽  
Water Use Efficiency ◽  
Water Use ◽  
Vegetative Growth ◽  
Growing Season ◽  
Light Interception ◽  
Row Spacing ◽  
Spike Density ◽  
Stubble Retention ◽  
Use Efficiency

A 3-year field study was undertaken to investigate the effect of row spacing on vegetative growth, grain yield and water-use efficiency of wheat. All 3 years of the study experienced 21–51% below-average rainfall for the growing season. Widening row spacing led to reduced biomass and tillers on per plant basis which could be related to the reduction in light interception by the wheat canopy in the wide rows which in turn could have reduced assimilate production. Reduction in vegetative growth in 54-cm rows translated into a significant reduction in grain yield which was strongly associated (r2 = 0.71) with the loss of spike density. The pattern of crop water use (evapotranspiration, ET) during the growing season was very similar for the three row-spacing treatments. However, there was some evidence for slightly lower ET (~5%) in 54-cm rows in two growing seasons. More importantly, there was no evidence for increased ET during the post-anthesis phase in wide rows as has been speculated by some researchers. Over the 3 years of the study, grain yield declined by 5–8% as row spacing increased from 18 to 36 cm and by a further 12–20% as row spacing increased from 36 to 54 cm. There was a consistent decline in water-use efficiency for grain (WUEG) with increasing row spacing over the 3 years. WUEG declined by 6–11% as crop spacing increased from 18 to 36 cm and declined further by 12–15% as row spacing increased to 54 cm. Lower light interception at wider row spacing could have reduced assimilate production by wheat as well as increased soil evaporation due to lower shading of the soil surface in more open canopies. Growers adopting wider row spacing on these relatively heavy textured soils are likely to experience some reduction in grain yield and WUEG. However, some growers may be prepared to accept a small yield penalty from intermediate row spacing as a trade-off for increased stubble retention and soil health.

scholarly journals INCREASING WATER PRODUCTIVITY OF LOWLAND RICE THROUGH THE WATER SAVING TECHNIQUES AND CROP MANAGEMENT IN RESPONSE TO DROUGHT

Agromet ◽  
2009 ◽  
Vol 23 (2) ◽  
pp. 123
Author(s):  
Didiek Setiobudi ◽  
Hasil Sembiring
Keyword(s):  
Grain Yield ◽  
Irrigation Water ◽  
Yield Components ◽  
Water Productivity ◽  
Moisture Stress ◽  
Water Saving ◽  
Lowland Rice ◽  
Wet Season ◽  
Soil Moisture Stress ◽  
Rice Varieties

The water saving technology for lowland rice cultivation was very crucial because of in the future irrigation water become scarce and competed with other sectors. The lowering of the availability of irrigation water had the impact for sustainability of rice production. The review of the paper described the pattern of basic water requirement, yield responses of several lowland rice varieties to moisture stress, days interval irrigation and the alternatives of water saving techniques for improving yield and water productivity. The pattern of the actual water requirement (ET+P&S) showed the maximum value of 8.8 mm/day (1.02 lt/sec/ha) for high yielding varieties (HYV) that occurred from heading to 50% flowering. Under limited water supply, irrigation water should be applied that period to prevent yield loss. Soil moisture stress at moderate level (- 0.5 bar) from heading to full flowering was significantly decreased yield about 30% when compared with the yield of continuously flooded 3 cm depth. This period was a critical period of HYV to soil moisture stress. For rotational irrigation purposes, information of the optimum days interval irrigation was important. It was found that 3 days irrigation interval was a critical limit for HYV to achieve higher yield. The SRI model of rice cultivation had the lowest rice yield in the lowland soil, poor drainage, clay soil texture and low permeability. The modified irrigation of the SRI plus fertilizer N based on LCC readings gave a greater yield as well as water productivity. The hybrid and NPT line rice varieties had higher yield components and grain yield than Ciherang variety. Ciherang variety was not favor to grown for the wet season, it was more productive when grown in dry season even with AWD irrigation model. The plant spacing of 25 cm x 25 cm gave higher number of panicle/hill and number of spikelet/panicle under both AWD and continuously flooded 3 cm depth for dry and wet season consistently. The fertilizer N management based on SSNM with low and high rates for the early vegetative stage were not significantly affected all yield components and grain yield. The AWD irrigation could save irrigation water about 18% when compared to the continuously flooded conditions.The grain yield of the hybrid, inbred and NPT line rice varieties was higher for the dry season than wet season under both AWD irrigation and continuous flooding consistently.

scholarly journals Pengaruh Pupuk Kandang dan Kesesuaian Varietas-Musim Tanam terhadap Hasil Padi Sawah

2014 ◽  
Vol 33 (3) ◽  
pp. 177
Author(s):  
Gagad Restu Pratiwi ◽  
Sumarno Sumarno
Keyword(s):  
Grain Yield ◽  
Organic Fertilizer ◽  
Rice Variety ◽  
Brown Planthopper ◽  
Production Capacity ◽  
Residual Effect ◽  
Wet Season ◽  
Rice Varieties ◽  
Significant Interaction Effect ◽  
Manure Treatment

Adaptive variety and organic fertilizer are important components for rice cultural practices in a spesific agroecology. The research objectives were (1) to clarify the direct and the residual effect of manure on grain yield of rice, (2) to identify rice varieties most suitable for dry and for wet season planting. The research was conducted at Sukamandi Exp. Farm, West Java, during dry season (DS) of 2010 and wet season (WS) of 2010/2011, using a split-plot design with three replications. The main plots of DS experiment consisted of (1) recommended dosage of NPK (115 kg N + 50 kg P2O5 + 50 kg K2O/ha) and (2) 80% dosage of NPK + 5 t manure/ha. The WS experiment, main plots were (1) recommended NPK and (2) the residue of manure given in DS + 80% of the NPK. The subplots were fifteen improved varieties, each planted on plot 3.4 m x 5.4 m with 20 cm x 20 cm plant spacing. Data were collected for agronomic variables and grain yield. The DS 2010 experiment was attacked by brown planthopper (BPH), only two varieties, Inpari-8 and Inpari-13 were resistant, each yielded around 6 t/ha, while thirteen varieties were susceptible, yielded between 0.14 t to 3.9 t/ha. Application of 5 t manure/ha increased the averaged of biomass and grain yields by 9% and 10%, respectively, but were not consistent among varieties. In WS 2010/2011 experiment, the residual manure + 80% NPK decreased the averaged grain yield, but there was a significant interaction effect between fertilizer x variety. Seven varieties yielded less, six varieties yielded similar, and two varieties yielded more on the residual manure treatment, compared to that on no-manure treatment. Biomass weight, plant height, days to flowering, and days to harvesting, each was significantly correlated with grain yield. Five varieties were identified as suitable for WS planting, namely: Inpari-3, Inpari-10, Inpari-7, Ciherang, and Mekongga. When outbreak of BPH was suspected in the DS, Inpari-8 and Inpari-13 were suggested for planting. Suitable variety(ies) for season specific planting would optimize productivity, conversely, planting of unsuitable rice variety, during either DS or WS planting, would decreased the land production capacity.

scholarly journals Nitrogen Response Behaviour of Developed Promising Lines of T.Aman Rice

2012 ◽  
Vol 37 (2) ◽  
pp. 207-213 ◽  
Author(s):  
PK Saha ◽  
SMM Islam ◽  
M Akter ◽  
SK Zaman
Keyword(s):  
Grain Yield ◽  
Nitrogen Nutrition ◽  
N Fertilization ◽  
Wet Season ◽  
Growth Duration ◽  
Rice Varieties ◽  
Nitrogen Response ◽  
Limiting Nutrient ◽  
Percent Nitrogen ◽  
Promising Line

Nitrogen is the most limiting nutrient for rice. Modern high yielding rice varieties may have differences in accumulating and using N from soil and applied fertilizer. A field experiment with 8 rice genotypes was conducted during 2008 wet season (T.Aman season) to study the effect of different rates of N fertilization on the yield performance and nitrogen nutrition under irrigated condition. Among the tested varieties/lines, BR7155-20-1-3 produced the significantly highest grain yield of 5.04 t/ha at N30 level followed by Swarna (4.66 t/ha) at the same level of N with similar growth duration (140 days). Agronomic efficiency of added N ranged from 0.7 to 23.3 for the promising line   BR7155-20-1-3 and 3.3 to 27.0 for variety Swarna. Grain yield at No was the highest in BR7155-20-1-3 followed by the variety Swarna and the lowest in BR7870-5 *(Nils)- I 0-HR8. Percent nitrogen recovery ranged from 50 to 63 for variety Swarna and 13 to 30 for promising line BR7155-20-1-3. The promising line BR7155– 20-1-3 and the variety Swarna may be economically advantageous over the other varieties/ lines. DOI: http://dx.doi.org/10.3329/bjar.v37i2.11222 Bangladesh J. Agril. Res. 37(2): 207-213, June 2012  

EFFECT OF VARYING MAIZE DENSITIES ON INTERCROPPED MAIZE AND SOYBEAN IN NEPAL

2005 ◽  
Vol 41 (3) ◽  
pp. 365-382 ◽  
Author(s):  
R. B. PRASAD ◽  
R. M. BROOK
Keyword(s):  
Grain Yield ◽  
Leaf Area ◽  
Field Experiments ◽  
Light Transmission ◽  
Maize Yield ◽  
Row Spacing ◽  
Area Index ◽  
The University ◽  
On Farm ◽  
Photosynthetic Adaptation

Maize and soybean are commonly intercropped in the drier zones of the western mid-hills in Nepal, but farmers report that productivity of soybean has been declining in recent years. Two researcher managed on-farm field experiments were conducted in the mid-hills environment of Nepal during 2001 and 2002, and one glasshouse experiment at the University of Wales, Bangor during 2003, to determine whether varying densities of maize and soybean influenced productivity of the system and to what extent soybean exhibited adaptation to shade. In neither season was maize yield affected by the presence of soybean, but grain yield of soybean was reduced in mixture by means of 59 and 53% during 2001 and 2002 respectively. Biomass and grain yield of maize were greatest at 53×103 plants ha−1 and least at the lowest density, whilst conversely biomass and grain yield of soybean increased. With increasing maize density, rates of accumulation of dry matter and leaf area index also increased, the latter resulting in decreasing transmission of light to the intercropped soybean. Soybean exhibited no photosynthetic adaptation to shade, but the specific leaf area was greater in artificially shaded and intercropped plants. Land equivalent ratios of all intercrops were greater than unity (1.30 to 1.45), indicating higher efficiency of intercropping compared to sole crops. Given the low plasticity in response of the maize canopy to variations in density, it is suggested that soybean could be better grown under maize by increasing between-row spacing of maize from 0.75 to 1.0 m to improve light transmission to the understorey, resulting in higher overall productivity of the intercropping system, and also that soybean germplasm be screened for adaptation to shade.

scholarly journals Optimization of Nitrogen Fertilization and Seedling Density of A New Rice Type (Oryza sativa L.) “IPB 3S”

2017 ◽  
Vol 4 (3) ◽  
pp. 94-101
Author(s):  
Sugiyanta Sugiyanta ◽  
Galih Angga Kusuma
Keyword(s):  
Grain Yield ◽  
Nitrogen Fertilization ◽  
Oryza Sativa L ◽  
Rice Seedling ◽  
Growth And Yield ◽  
Optimum Dose ◽  
Seedling Density ◽  
Plant Type ◽  
Rice Varieties ◽  
Rate Of Photosynthesis

The new plant type of rice, or ‘padi tipe baru’ (PTB) in Indonesian, is a new group of rice cultivars with a higher productivity compared to the modern rice varieties (‘varietas unggul baru’ or VUB). This study was conducted to determine the optimum dose of nitrogen fertilization and the seedling density or number of seedlings per hill to increase growth and yield of the new type of rice “IPB 3”. The experiment was conducted in the Bogor Experimental Station  in January to June 2015.  Nitrogen doses (90, 120, 150, 180 kg N.ha-1) and number of seeds per hill (1, 5, 10, 15 and 20) were tested.  The results showed that the increased dose of nitrogen fertilizer reduced the percentage of filled grains, the rate of photosynthesis and the grain yield per hectare. Similarly, an increase in the seedling density up to 15 seeds decreased the dry matter of the crop, the number of grains per panicle, and grain weight per plant, but increased the grain yield per hectare. The optimum yield of “IPB 3S” was achieved with  90 kg N.ha-1 with 15 seeds per hill. The results of this study have provided a guideline for an improved nitrogen management in relation to rice seedling population to increase yield of a new rice type “IPB3S”.Keywords:  “IPB 3S”, new plant type, fertilizer, local variety

scholarly journals Performance of Transplant Aus Rice Varieties under Different Nitrogen Management Practices

2021 ◽  
pp. 52-62
Author(s):  
Md. Omar Faruk ◽  
A. S. M. Iqbal Hussain ◽  
Md. Abu Yusuf ◽  
Md. Nazmul Hasan Mehedi
Keyword(s):  
Grain Yield ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Plant Height ◽  
Nitrogen Management ◽  
Grain Weight ◽  
Panicle Length ◽  
Rice Varieties ◽  
Area Index ◽  
1000 Grain Weight

Management of applied nitrogen in rice field is one tool that could lead to increase in rice yield, but often ignored by most farmers. The experiment was carried out from April to July 2015 at the Agronomy Field Laboratory of Patuakhali Science and Technology University, Dumki, Patuakhali to find out the influence of different nitrogen management and variety on the yield performance of transplant Ausrice. The study consisted of four levels of nitrogen viz. Control (without N), 30 kg N ha-1, 60 kg N ha-1 and urea super granule @ 52 kg N ha-1 and four Transplanted aus rice varieties viz. KaliHitta, ChaitaBoro, Abdul Hai and Gota IRRI, and was laid out in a split-plot design with three replications. The levels of nitrogen were assigned in the main plot and varieties were allocated in the sub-plots. Nitrogen management, variety and their interactions exerted significant (P ≤ 0.05) influence on plant characters, yield contributing characters and yield of transplanted Aus rice. In the case of nitrogen management, the tallest plant was 161.60 cm, maximum leaf area index(2.97, the highest number of effective tillers hill-115, longest panicle 24.30 cm with the maximum number of filled grains as94.73, 1000-grain weight gave 29.97 g. Grain yield of 2.48 t ha-1 were obtained from USG @ 52 kg N ha-1 and the shortest plant height of 136.90 cm with lowest leaf area index of 1.78, lowest number of effective tillers hill-1 (8.43), shortest panicle (18.84 cm) with the lowest numbers of filled grains panicle-1 (53.18), 1000-grain weight (24.33 g) and grain yield (1.40 t ha-1) were obtained in control (N1=O, kg N ha-1). Among the varieties, ChaitaBoro gave the tallest plant height (151.60 cm) and maximum leaf area index (2.54). While the highest number of effective tillers hill-1 (12.20), longest panicle (22.42 cm) with the maximum number of filled grains panicle-1 (73.50), highest 1000-grain weight (27.41 g) and highest grain yield (2.39 t ha-1) were recorded from Gota IRRI than other varieties. In case of interaction, Gota IRRI Fertilized with USG at 52 kg N ha-1 produced the highest number of effective tillers hill-1 (16.87), panicle length (25.13 cm), number of grains panicle-1 (105.70) and grain yield (3.13 t ha-1). The lowest number of effective tillers hill-1 (8.13), lowest panicle length (17.47 cm) with minimum numbers of filled grains 47.67) and grain yield (1.12 t ha-1) were produced by the interaction of control (N1=O, kg N ha-1) and Kali Hitta. So, cultivation of transplant Aus rice (Gota IRRI) appeared to be the best performance with USG @ 52 kg N ha-1 and recommended to the end users.

Sign in / Sign up

Export Citation Format

Share Document