scholarly journals Nitrogen content, SPAD index and production of single head broccoli

2021 ◽  
Vol 39 (1) ◽  
pp. 52-57
Author(s):  
Sanzio M Vidigal ◽  
Mário Puiatti ◽  
Iza Paula de C Lopes ◽  
Maria Aparecida N Sediyama
Keyword(s):  
Experimental Design ◽  
Nutritional Status ◽  
Nitrogen Content ◽  
Nitrogen Fertilization ◽  
Critical Level ◽  
Critical Levels ◽  
N Content ◽  
Total N ◽  
Maximum Value ◽  
N Rates

ABSTRACT In the management of single head broccoli nitrogen fertilization, there is no study indicating the critical level and adequate range of N content and SPAD index in the leaves to evaluate the nitrogen nutritional status. This work was carried out in two consecutive years with control without N and three rates of N (150; 300 and 450 kg ha-1). The treatments were arranged in the experimental design of random blocks, with four replications. All productive characteristics were significantly influenced by N rates. The fresh inflorescence mass reached a maximum value of 822 g with 308 kg ha-1 N. The critical levels were 61.1 g kg-1 for total N foliar content and 71.31 ud SPAD at 40 DAT. The SPAD index presented high correlations with the total N content in the leaves (r = 0.93; p<0.034) and with the maximum fresh mass of the inflorescence (r = 0.99; p<0.001). The ranges of N content (low ≤52.5; medium 52.6 to 57.4; sufficient 57.5 to 61.1 and high >61.1 g kg-1) and SPAD index (low ≤68.48; medium 68.49 to 70.47; sufficient 70.48 to 71.31 and high >71.31 ud SPAD) are proposed for assessing the N nutritional status of single head broccoli.

THE NUTRIENT COMPOSITION OF HYBRID CORN AS INFLUENCED BY FERTILIZATION: I. THE NITROGEN PERCENTAGE IN LEAF AND GRAIN

1960 ◽  
Vol 40 (1) ◽  
pp. 42-48
Author(s):  
J. M. Fulton ◽  
W. I. Findlay
Keyword(s):  
Nitrogen Content ◽  
Nitrogen Fertilization ◽  
Field Experiments ◽  
Critical Level ◽  
Clay Soil ◽  
Sandy Loam ◽  
Leaf Nitrogen ◽  
Luxury Consumption ◽  
Straight Line ◽  
Nitrogen Percentage

In field experiments on a sandy loam and a clay soil in 2 consecutive years, the yield of grain and percentage of nitrogen in ear shoot leaf and in the grain increased with increasing rates of nitrogen fertilization. The change in nitrogen percentage was greater for the leaf than for the grain and correlation between yield and nitrogen content was better for leaf samples than for grain samples. The relation between nitrogen content for the ear shoot leaf and yield was a straight line when rate of nitrogen fertilization was the only nutrient variable influencing yield. Thus, in this case, there was no evidence of luxury consumption or a critical level of nitrogen. However, when yield was limited by lack of phosphorus, luxury consumption of nitrogen did occur. The influence of applied nitrogen fertilizer on leaf nitrogen percentage was greater on the sandy loam than on the clay in spite of the fact that nitrogen percentage of the ear shoot leaf from the unfertilized plots was similar.

scholarly journals Effects of Different Fertilization Measures on Corn Yield and Soil Nitrogen Level in Hollow Village On the Loess Plateau

2021 ◽  
pp. 729-736
Author(s):  
Lei Shi ◽  
Zhong Zheng Liu ◽  
Liangyan Yang ◽  
Wangtao Fan
Keyword(s):  
Nitrogen Content ◽  
Loess Plateau ◽  
Total Nitrogen ◽  
Soil Nitrogen ◽  
Organic Fertilizer ◽  
Maize Yield ◽  
Corn Yield ◽  
Curing Agent ◽  
N Content ◽  
Total N

Problems of poor soil structure and nutrient deficiency in the reclamation of abandoned homesteads, and improvement of the soil condition after land reclamation to arable land and rapidly resume agricultural production were investigated. Organic fertilizers, curing agent and fly ash as amendment materials were selected. A plot test with seven different return materials in order to obtain the effects of different amendment materials on nutrient improvement in the reclamation of abandoned homestead soils in loess areas was conducted. After 3 years of maize crop cultivation, soil samples were collected and analyzed for total soil nitrogen content under different treatments. The results showed that the maize yield in each plot showed different additives contributed to the increase in maize yield to different degrees, while the addition of organic fertilizer had a more significant effect on the increase in yield. In the treatment of the experimental plots with the addition of curing agent + organic fertilizer, there was a significant effect on the enhancement of the content of total nitrogen in the soil tillage layer after three years of maize cultivation. The total N content of the surface soil (0~15 cm) increased from 0.32 to 0.64 g/kg, and that of the soil from 15~30 cm increased from 0.31 to 0.66 g/kg. The total N content of the soil from 0~60cm showed an increasing trend year by year, but the increase was gradually reduced. The total nitrogen content of soil in the depth of 60~105 cm showed a decreasing trend year by year. In the remediation of hollow villages in loess plateau, the compound application of organic fertilizer and ripening agent can significantly improve the soil nutrient content, condition of farmland and increase in maize yield, which is the most suitable material for field return in the remediation of hollow villages in loess plateau, and is of great significance to improve the quality of field return in the remediation of hollow villages. Bangladesh J. Bot. 50(3): 729-736, 2021 (September) Special

scholarly journals Nitrogen Fertigation Rates Affect Stored Nitrogen, Growth, and Blooming in Iris germanica ‘Immortality’

HortScience ◽  
2016 ◽  
Vol 51 (2) ◽  
pp. 186-191 ◽  
Author(s):  
Xiaojie Zhao ◽  
Guihong Bi ◽  
Richard L. Harkess ◽  
Jac J. Varco ◽  
Tongyin Li ◽  
...  
Keyword(s):  
Plant Height ◽  
Dry Weight ◽  
Growing Season ◽  
N Fertilizer ◽  
N Content ◽  
Total N ◽  
N Concentration ◽  
Inflorescence Stems ◽  
Iris Germanica ◽  
N Rates

Tall bearded (TB) iris (Iris germanica L.) has great potential as a specialty cut flower due to its fragrance and showy, multicolor display; however, limited research has been reported on optimal nitrogen (N) nutrient management for TB iris. The objectives of this study were to investigate the effects of N fertilizer rate on plant growth and flowering of ‘Immortality’ iris and determine the influence of both stored N and spring-applied N fertilizer on spring growth and flowering. On 14 Mar. 2012, rhizomes of ‘Immortality’ iris were potted in a commercial substrate with no starter fertilizer. Plants were fertigated with 0, 5, 10, 15, or 20 mm N from NH4NO3 twice per week from 28 Mar. to 28 Sept. 2012. In 2013, half of the plants from each of the 2012 N rate were supplied with either 0 or 10 mm N from 15NH415NO3 twice per week from 25 Mar. to 7 May 2013. Growth and flowering data including plant height, leaf SPAD, number of fans and inflorescence stems, and length of inflorescence stem were collected during the growing season. Plants were harvested in Dec. 2012 and May 2013 to measure dry weight and N concentration in leaves, roots, and rhizomes. Results showed higher 2012 N rates increased plant height, leaf SPAD reading, and number of inflorescence stems at first and second blooming in 2012. Greater 2012 N rates also increased plant dry weight and N content in all structures, and N concentration in roots and rhizomes. Rhizomes (58.8% to 66.3% of total N) were the dominant sink for N in Dec. 2012. Higher 2012 N rates increased plant height, number of fans, and the number of inflorescence stems at spring bloom in 2013. In May 2013, N in leaf tissue constituted the majority (51% to 64.3%) of the total plant N. Higher 2012 N rates increased total dry weight, N concentration, and N content in all 2013 15N rates; however, leaf dry weight in all plants was improved by 2013 15N rate. Percentage of tissue N derived from 2013 15N (NDFF) decreased with increasing 2012 N rate. New spring leaves were the dominant sink (56.8% to 72.2%) for 2013 applied 15N. In summary, ‘Immortality’ iris is capable of a second blooming in a growing season, this second blooming dependent on N fertilization rate in current year. A relatively high N rate is recommended to produce a second bloom.

scholarly journals Sweetpotato Growth and Nitrogen Content Following Nitrogen Application and Inoculation with Azospirillum

HortScience ◽  
1990 ◽  
Vol 25 (7) ◽  
pp. 758-759 ◽  
Author(s):  
Desmond G. Mortley ◽  
Walter A. Hill
Keyword(s):  
Root Growth ◽  
Nitrogen Content ◽  
Ipomoea Batatas ◽  
Storage Root ◽  
Nitrogen Application ◽  
Fertilizer N ◽  
Marketable Yield ◽  
N Content ◽  
N Rates ◽  
Leaf N

The influence of Azospirillum inoculation on sweetpotato Ipomoea batatas (L.) Lam.] was evaluated in combination with fertilizer N rates of 0, 40, and 80 kg·ha-1. Plants were inoculated with 5 ml of the inoculant at 2, 4, and 6 weeks after transplanting. Inoculation increased total and marketable yield by 12% and 17%, respectively, in 1984 and 5% and 22%, respectively in 1985. Higher storage root yields were accompanied by lower foliage yields, which suggested the inoculant may enhance storage root growth at the expense of foliage growth on soils with low to moderate N levels (40 to 80 kg·ha-1). Storage root N (1984 and 1985) and leaf N (1985) were higher for 40 kg N/ha with inoculation than with inoculation alone (treatments 4 vs. 2), which suggested that Azospirillum plus fertilizer N increased the N content of the plants.

Influence of nitrogen fertilization on cabbage yield, head nitrogen content and extractable soil inorganic nitrogen at harvest

1991 ◽  
Vol 71 (4) ◽  
pp. 1275-1280 ◽  
Author(s):  
B. J. Zebarth ◽  
S. Freyman ◽  
C. G. Kowalenko
Keyword(s):  
Nitrogen Content ◽  
Brassica Oleracea ◽  
Nitrogen Fertilization ◽  
Inorganic Nitrogen ◽  
N Recovery ◽  
Fertilizer N ◽  
Inorganic N ◽  
Total N ◽  
Brassica Oleracea L ◽  
Extractable Soil

Cabbage (Brassica oleracea L.) was fertilized at rates of 0, 100, 200, 300, 400 and 500 kg N ha−1. Yield and plant total N increased with increasing N rate. Apparent recovery of fertilizer N in the cabbage heads averaged 32% and was independent of N rate. Soil extractable inorganic N at harvest was low and increased with increasing N rate in only one of the 2 yr. Key words: Brassica oleracea, N recovery

scholarly journals Production of shoots from ‘Smooth Cayenne’ pineapple crowns with nitrogen fertilization

2020 ◽  
Vol 42 (3) ◽  
Author(s):  
Aurilena de Aviz Silva ◽  
Almy Junior Cordeiro de Carvalho ◽  
Paulo Cesar dos Santos ◽  
Marta Simone Mendonça Freitas ◽  
Roberto Rivelino do Nascimento Barbosa ◽  
...  
Keyword(s):  
Experimental Design ◽  
Nutritional Status ◽  
Nitrogen Fertilization ◽  
Apical Meristem ◽  
Dry Mass ◽  
Cultivation Conditions ◽  
Planting Material ◽  
Adequate Quality ◽  
Pineapple Fruit ◽  
Biometric Quality

Abstract Pineapple fruit crowns are rarely used as planting material in Brazil. However, they can be used to produce plantlet in situations of scarcity of planting material of adequate quality. The aim of this work was to evaluate the production and nutritional status of early shoots of different sizes produced from ‘Smooth Cayenne’ pineapple crowns with nitrogen fertilization after the removal of its apical meristem. The experimental design adopted was that of randomized blocks in a 4x4 factorial scheme, with four nitrogen doses (5, 10, 15 and 20 g of urea per pot), four minimum shoot lengths at harvesting (10, 15, 20 and 25 cm), with four replicates. Under full sun cultivation conditions, crowns produced 18.11 and 6.83 shoots with 10 and 25 cm in length, respectively, up to 380 days after planting and removal of the apical meristem. Pineapple shoots harvested at 180 days presented better biometric quality and can be harvested up to 380 days after crown planting. Increasing urea doses reduce P, K and Ca levels in the dry mass of shoots.

scholarly journals Productive and physiological responses of basil to nitrogen fertilization

2021 ◽  
Vol 39 (3) ◽  
pp. 335-340
Author(s):  
Italo MG Sampaio ◽  
Marcelo de A Guimarães ◽  
Janiquelle da S Rabelo ◽  
Caris dos S Viana ◽  
Francisca GA Machado
Keyword(s):  
Experimental Design ◽  
Stomatal Conductance ◽  
Plant Height ◽  
Nitrogen Fertilization ◽  
Physiological Responses ◽  
Physiological Traits ◽  
Carboxylation Efficiency ◽  
N Content ◽  
Fertilized Soil

ABSTRACT The aim of this study was to evaluate productive and physiological traits of basil cv. Italiano Genovese grown in nitrogen-fertilized soil. We studied five doses of nitrogen (25, 50, 75, 100 and 125 kg ha-1), in urea form. The experimental design was completely randomized, with four replicates. The maximum plant height was 79 cm, applying 65.7 kg ha-1 N. Shoot fresh and dry masses (814.1 g plant-1 and 111.4 g plant-1, respectively) and productivity (4.4 t ha-1) reached maximum values at 86.2; 80.2 and 82.5 kg ha-1 N, respectively. The highest N content in plant shoot was 26.1 g kg-1 at 125 kg ha-1 N. Photosynthesis and instantaneous carboxylation efficiency obtained maximum responses at doses of 85.3 and 83.3 kg ha-1 N, respectively. Stomatal conductance and transpiration increased with N additional rates.

scholarly journals Specific effects of certain salts on nitrogen metabolism of young corn seedlings

2014 ◽  
Vol 51 (2) ◽  
pp. 263-273 ◽  
Author(s):  
Mohammad Hatata
Keyword(s):  
Nitrogen Content ◽  
Nitrogen Metabolism ◽  
Salt Concentration ◽  
Salt Solutions ◽  
N Content ◽  
Total N ◽  
Specific Effects

The effect of sodium and magnesium chlorides and sulphates on nitrogen metabolism of corn seedlings and their constituent parts have been studied. Treatment with all salts led to a decrease in the nitrogen content of the seedling as a whole, and the decrease became more pronounced with the increase of salt concentration, though these concentrations were too low to induce any osmotic action. The same trend of changes was noticed as regards nonprotein-N, whereas the opposite was recorded in reference to the changes; of protein-N. Higher concentrations of the salt solutions led to leaching out of more nonprotein-N than did lower concentrations. The study of the distribution of nitrogenous constituents among the different organs of the seedling showed that while the total-N content of the whole seedling decreased with the increase of salt concentration, the total-N content of the roots decreased markedly, and the total-N content of the tops decreased also but less whereas, the total-N content of the grains increased with the increase of salt concentration as compared with that in the control. As a result of disturbances of nitrogen metabolism under salinization, more ammonia and amides were accumulated in all seedling organs.

scholarly journals In-row Distances and Nitrogen Fertilization Programs for ‘Tasti-Lee’ Specialty Tomato

2010 ◽  
Vol 20 (3) ◽  
pp. 579-584
Author(s):  
Bielinski M. Santos ◽  
John W. Scott ◽  
Maricruz Ramírez-Sánchez
Keyword(s):  
Solanum Lycopersicum ◽  
Nitrogen Fertilization ◽  
N Fertilization ◽  
Fruit Yield ◽  
Marketable Yield ◽  
Total N ◽  
Marketable Fruit ◽  
N Rates

‘Tasti-Lee’™ (‘Fla. 8153’) is the first tomato (Solanum lycopersicum) released in Florida exclusively for the premium specialty market, with characteristic superior flavor and elevated lycopene concentration. Research was conducted to determine the appropriate nitrogen (N) fertilization and in-row distances for ‘Tasti-Lee’ tomato and thus improving the opportunities for successful adoption for this cultivar. Three N fertilization programs and two in-row distances were tested. Total N rates (204, 239, and 274 lb/acre) were the result of the combination of 50 lb/acre of N during prebedding plus each of the following drip-applied N fertilization programs: 1) 1.5 and 2.0 lb/acre per day from 1 to 4 weeks after transplanting (WAT) and 5 to 12 WAT, respectively; 2) 1.5, 2.0, and 2.5 lb/acre per day during 1 to 2 WAT, 3 to 4 WAT, and 5 to 12 WAT; and 3) 1.5, 2.5, and 3.0 lb/acre per day during 1 to 2 WAT, 3 to 4 WAT, and 5 to 12 WAT, respectively. In-row distances were 18 or 24 inches between plants, providing 5808 and 4356 plants/acre. Early and total marketable yields of ‘Tasti-Lee’ tomato were influenced by in-row distances and N fertilization programs, but not by their interaction. The highest early marketable fruit yield was found in plots treated with the highest N rate among fertilization programs (+6%), and in plots planted 18 inches apart (+7%) in comparison with the lowest N rate and the 24-inch spacing. Tomato plots treated with the highest N rate (274 lb/acre) resulted in the largest total marketable yield (+8%). Among the in-row distances, when plants were transplanted 18 inches apart, tomato total marketable yield increased by 18% compared with 24 inches between plants.

Impact of Nitrogen Management Practices on Total Nitrogen in the Fruits of High Productive Hamlin Orange Trees

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 498e-498
Author(s):  
S. Paramasivam ◽  
A.K. Alva
Keyword(s):  
Crop Production ◽  
Management Practices ◽  
Fine Sand ◽  
Fruit Production ◽  
Perennial Crop ◽  
Total N ◽  
N Removal ◽  
Leaf N Concentration ◽  
N Rates ◽  
Orange Trees

For perennial crop production conditions, major portion of nutrient removal from the soil-tree system is that in harvested fruits. Nitrogen in the fruits was calculated for 22-year-old `Hamlin' orange (Citrus sinensis) trees on Cleopatra mandarin (Citrus reticulata) rootstock, grown in a Tavares fine sand (hyperthermic, uncoated, Typic Quartzipsamments) that received various N rates (112, 168, 224, and 280 kg N/ha per year) as either i) broadcast of dry granular form (DGF; four applications/year), or ii) fertigation (FRT; 15 applications/year). Total N in the fruits (mean across 4 years) varied from 82 to 110 and 89 to 111 kg N/ha per year for the DGF and FRT sources, respectively. Proportion of N in the fruits in relation to N applied decreased from 74% to 39% for the DGF and from 80% to 40% for the FRT treatments. High percentage of N removal in the fruits in relation to total N applied at low N rates indicate that trees may be depleting the tree reserve for maintaining fruit production. This was evident, to some extent, by the low leaf N concentration at the low N treatments. Furthermore, canopy density was also lower in the low N trees compared to those that received higher N rates.

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