Transplanting Date Research Articles

Digital mapping of dates of transplanting and accumulated thermal requirement of rice (Oryza sativa L.) in the subtropics of North Eastern Hill Region, India

ABSTRACT Accurate and timely mapping of rice areas is crucial for effective agricultural planning and food security management in the North Eastern Hill Region of India, especially amid changing climate conditions. This study developed a method to estimate rice transplanting dates by utilizing VH polarized backscattering-coefficients rom Sentinel-1A SAR data and also assessed thermal requirements for rice productivity in Ri-Bhoi district, Meghalaya during kharif 2021. The methodology involved 3 steps- (i) preprocessing data to construct time-series SAR images (ii) rule-based classification of SAR data integrating phenological and topographical information to identify transplanting windows (iii) assessing mapping accuracy. The results when compared with field data, revealed five distinct transplanting windows from early June to early August across 9031 ha of rice area. Overall accuracy was 85%, with a kappa coefficient of 0.74. User and producer accuracies ranged from 0.74 to 0.93 and 0.75 to 0.92, respectively for various transplanting windows. GDD varied between 1432.8°C day and 3290.4°C day, with higher values corresponding to earlier planting dates. This study formulates a robust methodology for rice mapping in hilly, small-field landscapes with multiple transplanting dates by integrating Sentinel-1A SAR data with ancillary and crop phenology information, contributing to improved crop management and climate change adaptations.

Effect of Transplanting Dates and Nutrient Management Options on Nutrient Partitioning and Accumulation in Rice

ABSTRACT Rice is the most important crop in India and additionally the hub of food security of the worldwide population. Integrated application of manures and fertilizers played a pivotal role for improvement of soil physico-chemical properties under different cropping systems as well as nutrient accumulation and grain yield in rice. The present investigation was conducted in sandy loam soil at Agronomy Research Farm of Odisha University of Agriculture and Technology, Bhubaneswar, Odisha, India during 2018–2019 having sub-humid climate. Field experiment was designed to evaluate the effect of two date of transplanting, which were allotted to main plots and three combinations of nutrient management options allotted for sub plots on rice crop (var. Naveen). Among all the plant parts, leaf showed higher accumulation of nitrogen (3.69, 1.92%), stem showed higher accumulation of both phosphorus (0.43, 0.35%) and potassium (2.59, 2.09%) than other plant parts during vegetative stages, while panicle showed higher accumulation of nitrogen (1.22%), phosphorus (0.28%) during harvesting stages of the rice crop. Significantly higher nitrogen accumulation in different plant parts were optimized under Soil Test Based Fertilizer Recommendation (STBFR) + Green Manure (GM; Sesbania rostrata) (0.99, 0.46, 1.28%) method of nutrient management, while phosphorus (0.10, 0.11, 0.28%) and potassium (1.00, 1.64, 0.33%) accumulation were found to be significantly higher in different plant parts under STBFR + Farm Yard Manure (FYM) method of nutrient management. Thus, early transplanting and application of STBFR + GM/FYM could be recommended for higher nutrient accumulation in rice crop.

Effect of transplanting dates on growth, yield and quality of broad leaf mustard (Brassica juncea L. var. rugosa) varieties at Rampur, Chitwan, Nepal

Broad Leaf Mustard, one of the most popular, highly commercialized, and widely grown green vegetables due to its richness in vitamin and minerals with peculiar taste. The precise knowledge of ideal planting time with right selection of variety provides suitable environmental conditions at all growth stages that increase the yield. The field experiment was carried at Horticulture Farm, Faculty of Agriculture, Agriculture and Forestry University, Rampur, Chitwan to evaluate the effect of transplanting dates on growth, yield and quality of Broad Leaf Mustard (Brassica juncea L. var. rugosa) varieties in Terai condition of Nepal during October 2021 to March 2022. The experiment was laid out in two factorial randomized complete block design (RCBD) with three replications. There were sixteen treatment combination comprising four varieties (Khumal Broad Leaf, Marpha Broad Leaf, Manakamana and Mike Giant) with four transplanting dates (October 25, November 9, November 24 and December 9). The results revealed that transplanting dates and varieties along with interaction significantly influenced the growth, yield and quality of Broad Leaf Mustard. Among the varieties, Khumal Broad Leaf was significantly superior on growth parameters like plant height, leaf length and breadth, plant canopy but on yield attributes the superior variety was Mike Giant based on number of leaves harvested per plot (226.08) and leaf yield (26.43 mt ha-1). However, the organoleptic test result revealed that the Mike Giant had excellent taste (74%) along with highest recovery percentage of Gundruk (27.62 %). Among the date of transplanting, mid transplanting on November 9 was better in terms of growth and leaf yield of 28.92 mt ha-1. While poorest performance was recorded on last transplanting on December 9 in all growth, yield and quality parameters with leaf yield of 17.36 mt ha-1. The interaction effect of different varieties and transplanting dates resulted better growth and quality in Khumal Broad Leaf and Manakamana varieties when transplanted on November 9. So based on the results of the experiment, Mike Giant transplanted on November 9 produced better growth and yield than others for the optimum yield production in Chitwan, Nepal.

Influence of transplanting date and integrated weed management in system of rice intensification of aromatic black rice (Oryza sativa)

A field experiment was conducted during rainy seasons (kharif) of 2019 and 2020 at the research farm of School of Agricultural Sciences, Nagaland University, Nagaland to study the effect of transplanting date and weed management practices on productivity and profitability of aromatic black rice (Oryza sativa L.) under system of rice intensification. The experiment was conducted in a split plot design (SPD) with 3 transplanting dates (D1, 15th June; D2, 30th June; and D3, 15th July) in main plot and 5 weed managements practices [W1, Weedy check; W2, Conoweeding at 20 and 40 DAT (days after transplanting); W3, Pretilachlor @0.75 kg/ha (PE) fb hand weeding (HW) at 40 DAT; W4, Pretilachlor @0.75 kg/ha (PE) fb conoweeder at 40 DAT; and W5, Pretilachlor at 0.75 kg/ha (PE) fb bispyribac-sodium @ 25 g/ha (PoE)] in sub-plot, replicated thrice. Results showed that the most abundant weed flora observed in the experimental field were Fimbristylis quinquangularis (Vahl) Kunth, Cyperus esculentus (L.), Cyperus iria (L.), Rhynchospora colorata (L.) H.Pfeiff., Ludwigia linifolia Poir, Mimosa pudica (L.), Mimosa diplotricha Sauvalle, Scoparia dulcis (L.) and Eriochloa villosa (Thunb.) Kunth. Transplanting on 15th June recorded highest growth and yield of black rice. The improvement in the grain yield was about 39% under 15th June over 15th July transplanting date. Among weed management practices, pretilachlor @0.75 kg/ha at 3 DAT fb HW at 40 DAT recorded minimum density of weeds resulting in higher growth attributes and yield of black rice. Economic analysis showed that highest benefit cost (B:C) ratio was obtained when black rice was transplanted on 15th June along with application of pretilachlor @0.75 kg/ha at 3 DAT fb bispyribac-sodium @25 g/ha at 20 DAT and demonstrated to be the best treatment for profitable production of black rice under system of rice intensification.

Optimum Transplanting Date for Rape Forage and Grain Yields in the Ridge Culture Place Planting System on the Yangtze River Delta

The ridge culture place planting system (RCPPS) is a promising technique for planting rapeseed that can promote the growth of rapeseed by late rice stubble, which has been widely adopted in the Yangtze River delta. To determine the optimum planting date for rape (Brassica napus L.) forage and grain yield in an intensive rice–rape rotation system, a field experiment was conducted with five transplantation dates (from 20 October to 30 November at 10 day intervals) in RCPPS. The forage/grain yield, nutrition, and growth parameters were analyzed. At podding, rape biomass yield was highest, and no significant differences were found among treatments. It was around 12.0% crude protein, 11.4% ether extract, 38.8% neutral detergent fiber, and 34.9% acid detergent fiber. In the treatments of 20 and 30 November, crude protein content increased and acid detergent fiber content decreased significantly. Compared with 20 October, the grain yield of rape transplanted in November decreased significantly by 17.2% to 22.5%. The grain yield was significantly correlated with the number of secondary branches, pods, and seeds. At the final flowering stage, rape transplanted in November had noticeably reduced leaf growth, rhizome width, and yield than 20 and 30 October. Overall, for multiple uses of rapeseed in the Yangtze River delta belt with RCPPS, it is optimal to plant in mid to late November for forage use with higher nutritional value, being coordinated with the previous rice crop, whereas late October is the appropriate planting time to obtain a higher grain yield.

The Effects of Transplanting Date on Management of Tobacco Insect Pests. Min review

The main review purpose this paper provides updated information on the effect of different transplanting dates on the infestation of tobacco insect pets were carried out at different location by different Scholars. The results revealed that different trials conducted in different agro ecological zone indicated that damage was higher and green leaves yield decrease were in late transplanted tobacco. While, the damage was gradually decrease and green leaves yield increase in early transplanted tobacco. Numerous species of insect pests of tobacco affect the crop in the field, in the greenhouse, and in storage. The effect tobacco insect pests reduced green leaf yield, quality and damage roots, leaves, buds parts of plants and others transmit several important tobacco disease pathogens. As management systems for flue-cured tobacco (Nicotiana tabacum L.) used different transplanting date were compared to evaluate their influence on insect pests’ damage, leaves yield and quality of flue-cured tobacco. The results indicated that early transplanted significantly increase leaf yield, growth parameters and decrease insect pest damage incidence. The study indicated that transplanted has pronounced positive effect on management of tobacco insect pests and growth of tobacco.

ChinaRiceCalendar – seasonal crop calendars for early-, middle-, and late-season rice in China

Abstract. Long time series and large-scale rice calendar datasets provide valuable information for agricultural planning and field management in rice-based cropping systems. However, current regional-level rice calendar datasets do not accurately distinguish between rice seasons in China, causing uncertainty in crop model simulation and climate change impact analysis. Based on satellite remote sensing data, we extracted transplanting, heading, and maturity dates of early-, middle-, and late-season rice across China from 2003 to 2022 and established a multi-season rice calendar dataset named ChinaRiceCalendar (https://doi.org/10.7910/DVN/EUP8EY, Liu et al., 2023). Overall, the ChinaRiceCalendar dataset shows good agreement with field-observed phenological dates of early-, middle-, and late-season rice in Chinese agricultural meteorological stations (AMSs). According to the calendar data from 2003 to 2022 in China, the transplanting dates for early-, middle-, and late-season rice shifted by +0.7, −0.7, and −5.1 DOY (day of year) per decade, respectively; the heading dates for early-, middle-, and late-season rice shifted by −0.5, +2.7, and −0.6 DOY per decade, respectively; the maturity dates for early-, middle-, and late-season rice shifted by −0.7, +3.8, and −1.6 DOY per decade, respectively. ChinaRiceCalendar can be utilized to investigate and optimize the spatiotemporal structure of rice cultivation in China under climate and land use change.

Effect of Transplanting Date and Harvesting Period on Bulb Production of Winter Onion (Allium cepa L.)

Climate change has brought about unpredictable temperature fluctuations and altered rainfall patterns, which directly impact onion cultivation. Adjustment in planting and harvesting schedules in the context of changing climate and environmental factors is not only academically significant but also holds practical implications for agriculture, resource management, climate adaptation, economic development, and food security in Bangladesh. The present study was carried out to observe the influence of the transplanting and harvesting time on maximizing onion production. The experiment followed a RCB design with three replications, involving the cultivation of BARI Piaz-1 as the test crop with varying transplanting dates on November 1st, November 15th, and December 1st, and harvesting periods at 120, 130, and 140 days after planting (DAP). The study's results indicated that the choice of transplanting date and harvesting period had significantly influenced onion yield and yield attributes. Improved performances, including increase in plant height, number of leaves per plant, neck diameter, bulb diameter, bulb length, bulb weight, and overall yield were observed when onions were transplanted on November 15th and harvested after 130 days from planting. The highest yields, specifically 10.32 t/ha in 2018 and 11.33 /ha in 2019, were achieved under this conditions. Conversely, the lowest yields 6.28 t/ha in 2018 and 6.70 /ha in 2019 were obtained when onions were transplanted on December 1st and harvested after 120 days from planting. Additionaly, early planting (November 1st) exhibited a higher incidence of bolting, while late planting (December 1st) showed a higher disease incidence. Therefore, optimizing transplanting dates to align with November 15th and a 130-day harvesting period proved to be the most effective strategy for maximizing onion yield and other attributes, while late planting and early harvesting adversely affected these key attributes.

Selection of Suitable Date of Transplanting for Year Round Production of Onion (Allium cepa L.) cv Agrifound Dark Red

Round the year onion production is an important issue to challenge the price fluctuation during different time of year and different location of the country. The present experiment was conducted at sub-tropical region of Uttar Pradesh during early kharif, kharif and late kharif season of 2021-22 and 2022-23 to find out the optimum date of transplanting and choice of suitable planting condition (raised and flat bed) for Agrifound Dark Red cultivar of onion for off-season production. The experiment consisted of nine dates of transplanting (1st day of April, May, June, July, August, September, October, November and December). Based on two years data of experiment which was laid out in two Factorial Randomized Block Design with three replications, results indicated that transplanting on 1st October showed maximum vegetative growth in terms of plant height (66.23 cm), number of leaves per plant (13.32), length of leaf (65.85 cm) was observed in plants when transplanted on 1st November (D8) at 120 days after transplanting (DAT). However, maximum neck thickness (21.92 mm) was recorded in 1st October transplanting, but the change was non-significant. The harvesting days might be early when transplanting was done on 1st July (D4) and October transplanting (D7) caused late harvesting as compared to others. It indicated that 1st October transplanting produced more bulb yield (347.76 q/ha) followed by 1st November transplanting. Among the two conditions, raised bed (B1) showed the better performance in respect of growth and yield specially in kharif season production. Therefore, it may be concluded that Agrifound Dark Red variety may be transplanted on 1st October to get maximum production in central Uttar Pradesh which may be beneficial for increasing farmers’ income.

Effect of Microclimate Modification on Growth and Yield of Basmati Rice under Punjab Conditions

The field experiments were conducted at the Research Farm, Department of Climate Change and Agricultural Meteorology, Punjab Agricultural University, Ludhiana during kharif 2018. Pusa Basmati variety was transplanted on 5th July (D1) and 15th July (D2) under three spacing (25 cm x12 cm, 20 cm x 15 cm and 30 cm x 10 cm). The micrometeorological data on photosynthetically active radiation (PAR) was recorded at different phenological stages. The periodic biometric observations on leaf area index were recorded. Growing degree days (GDD) were calculated at different phenological stages. The results indicate that PAR interception and leaf area index was higher under wider spacing (30 cm x 10 cm) followed by closer spacing (20 cm x 15 cm and 25 cm x 12 cm). The leaf area index was higher under wider spacing (30 cm x 10 cm) followed by closer spacing (20 cm x 15 cm and 25 cm x 12 cm). Correlation coefficients were worked out between periodic number of tillers of rice and temperature (maximum and minimum) and sunshine hours/day. In both dates of transplanting, maximum temperature showed a significant negative correlation with tiller number in most of the cases. The sunshine hours in both dates of transplanting showed a positive and significant correlation under different treatments. The first date of transplanting reported higher grain yield (30.61 q/ha) as compared to second date of transplanting (27.20 q/ha). The higher grain yield (30.57 q/ha) was recorded in basmati rice transplanted under wider spacing (30 cm x 10 cm) in comparison to closer spacing of 20 cm x 15 cm (29.25 q/ha) and 25 cm x 12 cm (26.89 q/ ha). Hence, microclimate modification through dates of transplanting and spacing is cost effective measure for increasing basmati rice yield.

Influence of Date of Transplanting and Level of Nitrogen on the Yield of Nizershail Rice Grown in Boro Season

Proper nitrogen (N) management is vital for gaining potential yield benefits of a variety. Adjusting transplanting time enables the plant taking benefit from natural conditions favorable for its growth. In light of these, an investigation was carried out in the Boro season at the Agronomy Field Laboratory, Bangladesh Agricultural University from November 2022 to April 2023 to investigate the impact of various transplanting dates and N levels on the yield of Nizershail rice. The study involved four dates of transplanting viz. 16 December, 31 December, 15 January, 30 January and four nitrogen (N) levels viz. 0, 50, 100 and 150% of the recommended dose (RD) of N from urea where the recommended dose was 90 kg urea per ha. The trial was replicated thrice using Randomized Complete Block Design (RCBD). Results showed that the tallest plant, the uppermost grains/panicle and 1000 grains weight were detected in 16 December transplanting and the maximum grain yield was observed in 31 December transplanting. For N, total tillers and effective tillers/hill, grains/panicle, the highest grain and straw yields were found from 100% RD of N and the highest panicle length and sterile spikelets/panicle were found from 150% RD of N. In interactions, the maximum effective tillers/ hill and straw yield were observed from 100% RD of N in combination with 15 January transplanting. The maximum 1000 grains weight and the grain yield were obtained from 100% RD of N in combination with 16 December transplanting. From the result, it may be assumed that to get the maximum yield of Nizershail rice in Boro season could be transplanted between 16 December to 15 January with 100% RD of N from urea.

Effect of Different Transplanting Dates on Performance of Different Varieties on Growth of Broccoli

The field trail was undertaken on the crop broccoli in the Rabi season of 2022-23 at Agriculture Research Farm, School of Agricultural Sciences and Technology RIMT University, Mandi Gobindgarh, Punjab to find out the “Effect of different transplanting dates on performance of different varieties on growth of broccoli”. The soil of the experimental plot had a slightly alkaline texture, a naturally occurring pH of 7.5, level of organic carbon (0.62%) and available amounts of N (430.32 kg/ha), P (17.54 kg/ha) and K (251.65 kg/ha). The experiment was designed in Factorial randomized block design (FRBD), replicated with three times and included nine treatments i.e. D1V1 (5th November + Rani Hybrid), D2V1 (15th November + Rani Hybrid), D3V1 (25th November + Rani Hybrid), D1V2 (5th November + Palam Samridhi), D2V2 (15th November + Palam Samridhi), D3V2 (25th November + Palam Samridhi), D1V3 (5th November + Bobby Hybrid), D2V3 (15th November + Bobby Hybrid) and D3V3 (25th November + Bobby Hybrid). The results indicated that significantly higher growth parameters viz., number of leaves per plant, plant height, leaf length, width and plant spread was observed on the 15th November transplanting as compared to 5th November and 25th November transplanting dates. In conclusion establishment of variety Palam Samridhi showed an excellent result on the 15th November transplanting date as compared to other transplanting dates.

Risk assessment of nitrogen runoff from rice fields under natural precipitation conditions based on different transplanting dates and water levels

Risk assessment of nitrogen runoff from rice fields under natural precipitation conditions based on different transplanting dates and water levels

Delayed Sowing under the Same Transplanting Date Shortened the Growth Period of Machine-Transplanted Early-Season Rice with No Significant Yield Reduction Caused

In early rice cultivation, the age of seedlings plays a crucial role in ensuring the annual safety production of double-cropping rice. When sowing staging and transplanting are performed simultaneously, it is still necessary to gather more data about the effects of seedling age on the growth period and grain yield of early rice machines transplanted. Two years ago, field experiments were conducted on machine-transplanted rice seedlings in the early season to compare the growth duration, crop growth characteristics, and yield attributes between the 18-day-old seedlings (SA18) and 32-day-old seedlings (SA32) of two rice cultivars. As a result of the study, it was found that SA18 reduced the total crop duration by between 11 and 12 days but delayed the maturity date by 2–3 days compared to SA32. SA18 had 14.5% fewer panicles per m2 and 3.6% less harvest index but 7.5% more spikelets per panicle higher than SA32. The grain yield of SA18 was 3.4% less than that of SA32, but there was no significant difference between the two seedling ages. The machine-transplanted seedlings for early rice production are more efficient in reducing seedling management time without affecting harvesting time and yields. The authors provide a new cultivation management scheme for farmers who are interested in planting double-cropping rice at the same time.

Assessing suitability of major meteorological factors for facility agriculture in mainland China

In China, more than two-thirds of protected cultivation occurs in low-tech facilities with limited ability to withstand adverse weather conditions. However, the specific meteorological factors that hinder facility agriculture production in various locations remain unclear. Here, we evaluated temperature and sunlight for assessing facility agriculture suitability in mainland China across different transplanting dates and ENSO phases (El Niño, La Niña, and Neutral) and to determine the optimal transplanting window. This aids in reducing climatic risks, and enhancing adaptation to changing climates. The results showed that growth cycles starting from March to June provide suitable temperature and sunlight, making them ideal transplanting window for many parts of northern China. However, both El Niño and La Niña significantly increased the high-temperature days and shortened the optimal transplanting window. For growth cycles starting from July to the following January, low temperatures are the primary factor limiting facility agriculture production in northern and western China. In southern China, sparse sunlight is the primary limiting factor year-round, and El Niño exacerbates this, particularly for growth cycles starting from September to November. This combined assessment of major meteorological factors, transplanting dates, ENSO phases, and regions, can assist decision-makers and growers in adapting to the changing climate and minimizing production risks.

Impact of transplanting dates, cultivars and zinc on performance of onion (Allium cepa)

An experiment was conducted during winter (rabi) seasons of 2020–21 and 2021–22 at Horticulture farm of Sri Karan Narendra Agriculture University, Jobner, Jaipur, Rajasthan to determine the effect of transplanting date, cultivar and zinc application method on growth, yield and quality of onion (Allium cepa L.). Experiment was conducted in split-plot design and replicated thrice. The treatments consist of 2 transplanting dates, viz. 10th December and 01st January; and 3 cultivars, viz. RO-01, RO-59 and Bhima Shakti were kept in main plot; and in sub- plots, 4 methods of zinc application, viz. control, soil application of ZnSO4 @25 kg/ha, dipping of onion seedlings in zinc solubilizer solution before transplanting and foliage spray of ZnSO4 @0.5% at 30 and 45 days after transplanting were kept. Significantly higher plant growth, bulb yield (416.8, 358.0 and 387.4 q/ha) and quality of onion were recorded in 01st January transplanting date. Among the cultivars, significantly higher plant growth, bulb yield (417.5, 358.4 and 388.0 q/ha) and quality of onion were recorded in Bhima Shakti but these parameters were at par with RO-59. In zinc application methods, significantly higher plant growth, bulb yield (41.5, 35.8 and 38.7 t/ha) and quality of onion were noticed under foliar application of ZnSO4 @0.5% but these were found at par with soil application of ZnSO4. Thus, the conclusion of findings was that the transplanting of Bhima Shakti cultivar on 01st January and with foliar application of ZnSO4 @0.5% had the potential effect to increase onion performance.

An Examination of the Effects of Different Transplanting Dates, Planting Geometry and Training Techniques on the Yield Traits, Productivity and Quality of Cucumber (Cucumis sativus L.) under Naturally Ventilated Polyhouse

An experiment was conducted to investigate the effect of date of transplanting, planting geometry and training system on the fruit yield and quality of cucumber (Cucumis sativus L.) under naturally ventilated polyhouse at the Research Farm of Department of Agricultural Engineering, College of Agriculture, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur, The experiment was laid out in Factorial Randomized Block Design with three replications and eighteen treatments, comprised of three date of transplanting (1st fortnight of March, 2nd fortnight of March and 1st fortnight of April), two planting geometry viz., 60 cm x 30 cm, 75 cm x 30 cm and three training systems viz., two shoots, three shoots and four shoots. Results revealed that plants transplanted earlier (1st fortnight of March) at a wider spacing of (75 cm x 30 cm) recorded significantly higher number of fruits per plant, fruit length, fruit weight and total soluble solids, while maximum fruit yield was recorded under closer spacing of 60 cm x 30 cm. With regards to the number of shoots per plant, plants with three shoots recorded significantly higher fruit yield. So it can be concluded that plants transplanted in the 1st fortnight of March, trained to three shoots and spaced at 60 cm x 30 cm apart were found to be the best for higher fruit yield and better quality of the produce.

Effect of Transplanting Dates on the Paddy (Oryza sativa L.) Cultivar CR Dhan 307 (Maudamani) in Terai Zone of West Bengal, India

Aims: Paddy cultivar, CR Dhan 307 (Maudamani) can enhance paddy productivity due to its heavy panicles and high-density planting adaptability. Date of transplanting is one of the important non-monetary inputs which greatly influence the growth and yield of paddy. The appropriate date of transplanting ensures optimum vegetative growth during the period of satisfactory temperature and solar radiation level. In India, maximum rice farmers are unable to transplant their crop timely, which reduces rice yield significantly and increases total cost of cultivation. This research aimed to study the effect of different dates of paddy transplanting on the performance of CR Dhan 307 (Maudamani) and to find out the optimum date of transplanting in terai zone of West Bengal.
 Study Design: Randomized block design with 4 replications.
 Place and Duration of Study: The experiment was conducted in rabi season, 2017-18 at the instructional farm of Uttar Banga Krishi Viswavidyalaya, Pundibari, Coochbehar, West Bengal.
 Methodology: Five treatments namely transplanting on 2nd January, on 14th January, on 26th January, on 8th February and on 20th February allocated randomly in each replication.
 Results: Paddy transplanted on 26th January provided the maximum increment in almost all the growth attributes on all the dates such as no. of tillers m-2 at 90 DAT (252.77), dry matter accumulation at 90 DAT (1595.20 g m-2) etc. and yield attributes such as no. of panicles m-2 (210.64), no. of grains panicle-1 (280.46), no. of filled grains panicle-1 (233.34) etc. vis-à-vis grain productivity (7.59 t ha-1) and harvest index (44.20%). Highest gross return (Rs. 132825.00 ha-1), net return (Rs. 83336.00 ha-1) and benefit-cost ratio (2.68:1) as well as the incremental benefit-cost ratio (1.68:1) were obtained from the same treatment.
 Conclusion: Paddy transplanting on 26th January can be recommended for the cultivar, CR Dhan 307 (Maudamani) for achieving highest productivity and profitability.

Production potential of short duration rice (Oryza sativa) in relation to age of seedlings, date of transplanting and crop geometry

An experiment was conducted at the research farm of Punjab Agricultural University, Ludhiana, Punjab during 2018 and 2019 to determine the production potential of rice (Oryza sativa L.) in relation to age of seedlings, date of transplanting and crop geometry. The results revealed that growth and productivity of short duration rice crop were improved by transplanting younger seedlings of 3 and 4 weeks age (nursery sown on June 12 and June 19) as compared to the older ones 5 and 6 week old seedlings (nursery sown on May 29 and June 5). Transplanting of rice at 25th June and 10th July with 20 cm × 15 cm crop geometry recorded better growth, yield attributes and higher yield as compared to 15 cm × 15 cm crop geometry. Rice transplanted on 10th July required fewer irrigations (14 and 17) as compared to the crop transplanted on June 25 (16, 19) in 2018 and 2019, respectively. This led to a water saving of 12.5 and 10.5% during those respective years, without compromising the yield. It is worth noting that a single irrigation was applied at a depth of 7.5 cm. For higher saving in irrigation water, nursery of PR 126 can be sown up to June 20 and 25–30 days old seedlings can be transplanted up to July 10 at 20 cm ×15 cm spacing.

Effect of Transplanting Date and Spacing on Seed Production of Broccoli (Brassica oleracea var. italica Plenck) at Chitwan, Nepal

A study was conducted at the Agriculture and Forestry University, Rampur, Chitwan during the winter season, to find out the suitable transplanting dates and spacing for quality seed production of broccoli (Brassica oleracea var. italica) Cv. Calabrese. The experiment was laid out in split plot design with three replications, where main plot treatment consisted of transplanting dates (November 1, November 15 and November 30) and sub plot treatment consisted of spacing (60 cm × 50 cm, 60 cm × 60 cm, 60 cm × 75 cm). Since transplanting time and spacing affect vegetative traits, which are very important for seed yield. The highest seed yield (1.09 mt./ha) was obtained with November 1st planting at the spacing of 60 cm × 50 cm. So that transplanting date of November 1st with spacing 60 cm × 50 cm is better for seed production of broccoli in plain areas of Chitwan, Nepal.