scholarly journals Effects of Three Harvest Intervals and Two Fertilizer Rates on the Yield and HCN Content of Ten Cynodon Cultivars

1969 ◽  
Vol 63 (1) ◽  
pp. 35-44
Author(s):  
J. Vélez-Santiago ◽  
A. Sotomayor-Ríos ◽  
S. Torres-Rivera
Keyword(s):  
Puerto Rico ◽  
Acid Content ◽  
Crude Protein ◽  
Cynodon Dactylon ◽  
Forage Yield ◽  
Protein Yield ◽  
Hydrocyanic Acid ◽  
Forage Grasses ◽  
Harvest Intervals ◽  
Fertilizer Rates

Ten forage grasses (Cynodon spp.), including recent introductions, and Stargrass (C. nlemfuensis var. nlemfuensis) were grown in the central mountains of Puerto Rico to measure the effect of two fertilizer rates and three harvest intervals on the forage yield, crude protein yield and hydrocyanic acid content (HCN) for a 2-year period. Fertilizer treatments applied after each harvest consisted of 2.24 and 4.48 metric tons/ha/year of a 15-5-10 fertilizer. Significant differences occurred between fertilizer rates as to dry forage and crude protein yields. Number of harvests per year were 6, 8 and 12 for 30-, 45- and 60-day intervals, respectively. Significant differences occurred among cultivars and harvest intervals. Cynodon dactylon (PRPI 11504), C. plectostachyus (PRPI 11487) and C. nlemfuensis var. nlemfuensis (PRPI 2341) occupied most of the top yield positions at the three harvest intervals. HCN within the cultivars ranged from 0 to 333 p/m.

scholarly journals Effect of Three Harvest Intervals on Yield and Composition of Nineteen Forage Grasses in the Humid Mountain Region of Puerto Rico

1969 ◽  
Vol 60 ◽  
pp. 294-309
Author(s):  
A. Sotomayor-Ríos ◽  
J. Vélez-Santiago ◽  
S. Torres-Rivera ◽  
S. Silva
Keyword(s):  
Puerto Rico ◽  
Crude Protein ◽  
Sharp Decrease ◽  
Significant Negative Correlation ◽  
Forage Yield ◽  
Mountain Region ◽  
Forage Grasses ◽  
Average Temperature ◽  
Harvest Intervals ◽  
Positive Correlations

The response of 19 forage grasses to three cutting intervals in the humid mountain region of Puerto Rico was evaluated. Nine Brachiarias, nine Digitarias, and one Cynodon species were evaluated during a 2-year period under cutting management at the Corozal Substation for green forage (GF), dry forage (DF), and crude protein (CP) yields and for dry matter (DM), crude protein (CP), Ca, P, K, and Mg contents. In terms of green forage yield (GFY), the most productive species at the 30-day harvest interval was D. setivalva (PRPI 6402) with 86,794 kg/ ha/year. At the 45- and 60-day harvest intervals, Brachiaria sp. (PRPI 9626) produced 102,116 and 109,213 kg/ha/year, respectively. This species also produced the highest DFY at the 30-day harvest interval with 18,430 kg/ha/year. C. nlemfuensis, var. nlemfuensis (PRPI 2341), stargrass, and B. decumbens (PRPI 5365) produced the highest DFY at the 45- and 60-day intervals with 21,758 and 27,238 kg/ha/year, respectively. The highest CP content at the 30-, 45-, and 60-day intervals was observed on the three Digitaria hybrids, D. pentzii x D. smutzii (PRPI 9621), D. pentzii x D. milanjiana (PRPI 9619), and D. pentzii x D. pentzii (PRPI 9620) with 14.3, 12.0, and 11.1 %, respectively. D. decumbens (PRPI 6439), 'Transvala' Digitgrass, produced the highest CP yield at the 30-day harvest interval with 2, 179 kg/ha/year. Stargrass had the highest CP yield at the 45- and 60-day harvest intervals with 2,141 and 2,030 kg/ha/year, respectively. The P, Ca, Mg, and K contents of the 19 grasses on the average decreased as the harvest interval increased. A sharp decrease (from 1.81 to 1.47 to 1.42%) of the K content of the grasses was observed at the 30-, 45-, and 60-day intervals, respectively. The GFY, DFY, and DM of the 19 grasses increased on the average with the length of the harvest interval. On the other hand, the CP content and yield of the 19 grasses decreased as the harvest interval increased. No significant correlation was obtained between total rainfall, CP, and DFY of the 19 grasses. Significant positive correlations were obtained between DFY of the 19 grasses and average temperature. A significant negative correlation was obtained between average temperature and CP content.

scholarly journals Evaluation of Seven Forage Grasses at Two Cutting Stages

1969 ◽  
Vol 57 (3) ◽  
pp. 173-185
Author(s):  
A. Sotomayor Ríos ◽  
A. Acosta Matienzo ◽  
J. Vélez Fortuño
Keyword(s):  
Crude Protein ◽  
Cynodon Dactylon ◽  
Forage Yield ◽  
Forage Grasses ◽  
Brachiaria Brizantha ◽  
Second Best ◽  
Brachiaria Ruziziensis ◽  
Digitaria Decumbens ◽  
Cynodon Nlemfuensis ◽  
Forage Yields

Seven forage grasses, i.e., Tanner (Brachiaria cf. mutica), a bermuda grass selection (Cynodon dactylon var. coursii), glabrous Signal (Brachiaria brizantha), Signal (Brachiaria brizantha), Congo (Brachiaria ruziziensis), Star (Cynodon nlemfuensis var. nlemfuensis) and Pangola (Digitaria decumbens) were cut at a 60-day harvest interval and at the optimum stage for harvest during a 2-year period at the Gurabo Substation. It was considered that plants had reached the optimum stage for harvest when flowering and yellowing of leaves at the basal parts of the plant began to appear and the grasses had attained a reasonable forage volume as compared to adjacent plots harvested every 60 days. At the 60-day harvest interval, the top yielder was the glabrous Signal; this grass produced 72.78, 19.85 and 1.40 tons of total green, dry forage, and crude protein per acre per year, respectively. Signalgrass was second best with 69.93,16.87 and 1.20 tons of green, dry forage and crude protein per acre per year, respectively. At the optimum stage for harvest, the top yielder in terms of total green forage per acre per year was Congograss with 70.40 tons. The best dry forage and crude protein yielder was glabrous Signal with 18.84 and 1.54 tons per acre per year, respectively. Pangolagrass was second best in terms of total green and dry forage per acre per year with 69.90 and 17.30 tons, respectively. The green forage yields of the grasses studied, except Tannergrass, were similar when cut at the 60-day harvest interval as compared to the optimum stage for harvest. The annual dry forage yield also was similar at the two cutting stages, except Tannergrass and C. dactylon var. coursii. Significantly higher protein yields were obtained at the optimum stage for harvest in all forages with the exception of Signalgrass. Glabrous Signal (Brachiaria brizantha), USDA PI 255346, was the top dry forage yielder of the seven grasses studied. This grass produced about 20 tons of dry forage (73 tons of green forage) containing 7.1 percent of protein and about 19 tons of dry forage (69 tons of green forage) containing 8.2 percent of protein, at the 60-day harvest interval and at the optimum stage for harvest, respectively.

Yield Comparison of Four Forage Grasses at Two Cutting Heights and Three Harvest Intervals

1969 ◽  
Vol 58 (1) ◽  
pp. 26-36
Author(s):  
A. Sotomayor-Ríos ◽  
J. Rodríguez-García ◽  
S. Silva
Keyword(s):  
Crude Protein ◽  
Cynodon Dactylon ◽  
Forage Grasses ◽  
Digitaria Decumbens ◽  
Harvest Intervals ◽  
Cutting Interval ◽  
Harvesting Intervals ◽  
Forage Yields ◽  
Brachiaria Mutica ◽  
Interval Interaction

Four forage grasses, i.e., Pangola, Digitaria decumbens Stent; Tanner, Brachiaria mutica; a Bermuda selection, Cynodon dactylon var. coursii and Hexapangola, Digitaria decumbens Stent, were evaluated under cutting management at the Corozal Substation located in the humid mountainous region of Puerto Rico. The effects of cutting heights of 2 and 6 inches above the ground, and of 30-, 45- and 60-day harvesting intervals were determined over a 2-year period. All grasses received 2 tons of 15-5-10 fertilizer per acre per year. At all cutting heights and harvest intervals, Bermuda (Cynodon dactylon var. coursii) had the highest dry forage yields while Pangola and Hexapangola had the highest crude protein contents. At all harvest intervals the grasses produced more total yields and crude protein per acre yearly when cut to a height of 2 inches than when cut to 6 inches above the ground. Green and dry forage yields produced by the grasses increased and on the average, crude protein content of the grasses decreased with the length of the harvest interval. A significant variety X cutting interval interaction was observed for total dry forage yields. Lower yields were obtained during the dry winter months at all cutting intervals. When cut 2 inches above the ground and every 60 days, Bermuda (Cynodon dactylon var. coursii) produced 28,247 pounds of dry forage per acre yearly containing about 9.0 percent crude protein.

CLIPPING FREQUENCY AND FERTILIZER EFFECTS ON PRODUCTIVITY AND LONGEVITY OF FIVE GRASSES

1961 ◽  
Vol 41 (1) ◽  
pp. 97-108 ◽  
Author(s):  
D. H. Heinrichs ◽  
K. W. Clark
Keyword(s):  
Crude Protein ◽  
Competitive Ability ◽  
Forage Yield ◽  
The Other ◽  
Protein Yield ◽  
Agropyron Cristatum ◽  
Cold Climates ◽  
Agropyron Intermedium ◽  
Pasture Grasses

Agropyron cristatum, Agropyron intermedium, Agropyron riparium, Elymus junceus and Stipa viridula were studied in relation to clipping effects on productivity and longevity. All species, except Elymus junceus, produced progressively less as number of clippings increased. Agropyron intermedium yielded the most forage, especially when harvested only once per season, followed closely by Agropyron cristatum. Crude protein yield was less variable under various frequencies of clipping than forage yield, and differences between species were also smaller. Elymus junceus and Agropyron cristatum displayed the strongest competitive ability, especially under frequent clipping and Stipa viridula the lowest. The amount of root produced varied significantly between species. Agropyron cristatum and Elymus junceus produced the most root and Stipa viridula the least. Fertilizer applied in the fourth and fifth crop years increased the yield by 30 to 200 per cent. It was concluded that Agropyron cristatum and Elymus junceus were about equally persistent under frequent clipping and should be more useful long-term pasture grasses than the other three in dry cold climates.

Effects of Harvest Intervals on the Yield and Composition of 10 Forage Grasses

1969 ◽  
Vol 58 (4) ◽  
pp. 448-455
Author(s):  
A. Sotomayor-Ríos ◽  
F. J. Juliá ◽  
J. A. Arroyo-Aguilú
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Dry Matter Yield ◽  
Forage Grasses ◽  
Mineral Absorption ◽  
Digitaria Decumbens ◽  
Harvest Intervals ◽  
Digitaria Eriantha ◽  
Digestible Protein ◽  
Cynodon Nlemfuensis

The effect of three harvest intervals (30, 45 and 60 days) on the yield, crude protein (CP), digestible protein (DP), and mineral (calcium, Ca; phosphorus, P; potassium, K; and magnesium, Mg) composition of 10 forage grasses was determined during a 1-year period at the Isabela Substation. The species studied included three Brachiarias, five Digitarias and two Cynodons. As the 30-day harvest interval, the dry matter yield (DMY) ranged from 25,859 to 19,041 pounds per acre per year. The highest DMY was obtained by Transvala digitgrass (Digitaria decumbens, PRPI. 6439) Stargrass (Cynodon nlemfuensis PRPI. 2341) had the highest CP and DP contents. The highest DMY at the 45-day interval was obtained by Transvala digitgrass, being significantly different (P < .05) from other grasses. The DMY ranged from 29,532 to 20,962 pounds per acre per year. Digitaria eriantha had the highest CP and DP contents. Stargrass had the highest DMY and CP at the 60-day harvest interval. The DMY ranged from 37,504 to 30,269 pounds per acre per year. Mean Ca and Mg contents in the grasses increased at the 45-day interval, with no Ca increase but a Mg decrease at 60 days. Mean P and K contents decreased as the harvest intervals increased. The yielding ability of the grasses was encouraging, especially in the Transvala digitgrass and Stargrass species. The CP and DP contents tended to vary as plants matured, suggesting that studies of mineral absorption and/or utilization of forage grasses by niminants should be undertaken.

Nitrogen Fertilization and Cutting Frequency, Yield and Chemical Composition of Five Tropical Grasses

1969 ◽  
Vol 67 (2) ◽  
pp. 61-69
Author(s):  
J. Velez-Santiago ◽  
J. A. Arroyo-Aguilu
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
N Fertilization ◽  
Forage Grasses ◽  
Digitaria Decumbens ◽  
Tropical Forage ◽  
Cutting Frequency ◽  
Harvest Intervals ◽  
Agricultural Experiment ◽  
Cynodon Nlemfuensis

Five tropical forage grasses: Star (Cynodon nlemfuensis), Transvala digit (Digitaria decumbens), Pangola (Digitaria decumbens) and two Limpos (Hemarthria altissima, Bigalta and Greenalta), were cultivated without irrigation for 1.5 years at the Corozal Agricultural Experiment Substation to study the effects of 3 N fertilization levels and 3 harvest intervals (30, 45, and 60 days) on the green forage (GF), dry forage (DF), and crude protein (CP) yields and on the dry matter (DM), CP, P, and K contents. The soil is a Corozal clay (Uitisol). N levels, as (NH4)2SO4, applied after each harvest, included low, 224; medium, 448; and high, 896 kg/ha/yr. P and K were applied at rates of 112 and 336 kg/ha/yr, respectively. DM content and DF and CP yields increased significantly with longer harvest intervals. The medium N level resulted in the highest CP yields, except in the case of Star grass, in which high N fertilization gave greater CP yield. Bigalta, Star, and Transvala digit cultivars exhibited the highest GF, DF, and CP yields. DF yields (means across the 3 harvest intervals and the 3 N levels) for Bigalta, Greenalta, Transvala, Star, and Pangola grasses were 35,421; 29,209; 31 ,699; 32,383; and 24,461 kg/ha/yr, respectively.

scholarly journals Row Arrangements of Maize and Soybean Intercrop on Silage Quality and Grain Yield

2019 ◽  
Vol 11 (2) ◽  
pp. 286
Author(s):  
Vanderson Vieira Batista ◽  
Paulo Fernando Adami ◽  
Pedro Valério Dutra de Moraes ◽  
Karine Fuschter Oligini ◽  
Cleverson Luiz Giacomel ◽  
...  
Keyword(s):  
Grain Yield ◽  
Crude Protein ◽  
Biomass Yield ◽  
Block Design ◽  
Forage Yield ◽  
Protein Yield ◽  
Maize Grain Yield ◽  
Sole Crop ◽  
Silage Quality ◽  
Maize Grain

The success of maize + soybean intercrop depends on the plant arrangement. An experiment was carried out to evaluate different row arrangements on intercrop forage yield, silage quality and maize grain yield in relation to maize as a sole crop. The experiment was set up with a randomized complete block design with eight row arrangements between maize and Soybean. Maize biomass yield among crop arrangements were similar, although, lower than the maize sole crop. On the other hand, these treatments showed higher soybean biomass yield, which in turn increased silage crude protein and crude protein yield per unit area. Maize thousand grain weight, grain yield per plant and per area was affected by the intercrop arrangements. The use of two corn rows + two soybean rows (2M+2S-30 cm) and four corn rows + four soybean rows (4M+4S-30 cm) showed higher crude protein yield per area associated with similar maize grain yield in relation to the sole maize crop. In conclusion, alternating four maize rows with four soybean rows was the optimum row ratio in maize + soybean intercrop, though this needs to be further confirmed by more trials.

scholarly journals Effect of Three Harvest Intervals on the Yield and Protein Content of Ten Brachiarias

1969 ◽  
Vol 65 (2) ◽  
pp. 147-153
Author(s):  
A. Sotomayor-Ríos ◽  
J. Rodríguez-García ◽  
J. Vélez-Santiago
Keyword(s):  
Puerto Rico ◽  
Protein Content ◽  
Crude Protein ◽  
Dry Matter ◽  
Brachiaria Humidicola ◽  
Harvest Intervals ◽  
Signal Grass

Ten Brachiarias were evaluated during an 18-month period at various harvest intervals at the Corozal Substation for yields of green forage (GF), dry forage (DF), and crude protein (CP), and for contents of (CP) and dry matter (DM). At the 30-day harvest interval, the most productive introduction was Brachiaria humidicola (P.I. 299497), with 119,567 and 22,548 kg/ha/year of GF and DF, respectively. Para grass (B. mutica) and B. ruziziensis (P.I. 247404) had the highest DM content, 22.5%. Para grass also had the highest CP yield, 2,961 kg/ha/year. At the 45-day harvest interval, B. humidicola (P.I. 299497) had the highest GF yield, 160,459 kg/ha/year, while para grass had the highest DM content, 22.5%. Para grass was the highest DF yielder, with 31,338 kg/ha/year, and B. humidicola (P.I. 299497) was the highest CP yielder, with 3,787 kg/ha/ year. At the 60-day harvest interval, B. humidicola (P.I. 299497) was the highest GF yielder, with 146,318 kg/ha/year, while para grass had the highest DM content and DF and CP yields, 25.9%, 36,946 kg/ha/year, and 3,264 kg/ha/ year, respectively. The GF and DF yields increased with length of the harvest interval. The DM contents, however, were similar at the 30- and 45-day intervals and higher at the 60-day interval. The CP yields increased from 2,651 kg/ha/year at the 30-day harvest interval to 2,912 kg/ha/year at the 60-day harvest interval. The DF and CP yields of B. humidicola (P.I. 299497), para grass, signal grass (B. brizantha, P.R. P.I. 1525), and others were excellent and compared favorably with those of the recognized top-yielding grasses in Puerto Rico.

scholarly journals Assessment of yield, quality and nitrogen index of Agrostietum capillaris grassland as affected by fertilizations

2020 ◽  
Vol 36 (1) ◽  
pp. 101-113
Author(s):  
Aleksandar Simic ◽  
Violeta Mandic ◽  
Savo Vuckovic ◽  
Zorica Bijelic ◽  
Rade Stanisavljevic ◽  
...  
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Nitrogen Nutrition ◽  
N Uptake ◽  
Forage Yield ◽  
Protein Yield ◽  
Mineral Fertilizers ◽  
Dry Matter Yield ◽  
Nitrogen Nutrition Index ◽  
Yield Quality

Managing N, P and K inputs in semi-natural meadow production systems is important for achieving maximum yields in livestock farming. The objective of the present study was to estimate the effect of different NPK levels (N0P0K0, N50P50K50, N100P50K50, N100P100K100, N150P100K100 and N200P150K150 kg ha-1 yr-1) on the yield, quality and nitrogen nutrition index (NNI) in a grassland community of Agrostietum capillaris (semi-natural meadow) in western Serbia. The study was conducted during the seasons of 2005-2008. The values of the investigated parameters, except for the unit N uptake, were the highest in 2004/2005 due to favorable climate conditions. The levels of nitrogen significantly increased all of the studied parameters compared to the control treatment, except for unit N uptake. Mineral fertilizers at N200P150K150 provided the highest green forage yield (25.12 t ha-1), dry matter yield (8.12 t ha-1), crude protein yield (876.3 kg ha-1), nitrogen uptake (140.2 kg ha-1) and nitrogen nutrition index (70.2%), and the lowest unit N uptake (0.0022 kg N kg DMY-1). The use of mineral fertilizers increased green forage yield, dry matter yield and crude protein yield, increasing fertilizer from lowest to highest rate increased fresh and dry matter yield, as well as protein yield. Based on the results of the study, monitoring of nutrition indices would be necessary in order to increase productivity and economic benefits.

scholarly journals Composition of Cassava (Manihot esculenta Crantz) and the Rheological Characteristics of its Starch

1969 ◽  
Vol 60 (1) ◽  
pp. 93-98 ◽  
Author(s):  
E. J. Rodríguez-Sosa ◽  
O. Parsi-Ros ◽  
M. A. González
Keyword(s):  
Puerto Rico ◽  
Dominican Republic ◽  
Acid Content ◽  
Proximate Composition ◽  
Manihot Esculenta ◽  
Tuberous Root ◽  
Hydrocyanic Acid ◽  
Rheological Characteristics ◽  
Manihot Esculenta Crantz ◽  
Toxicity Level

Proximate composition of two edible commercial varieties of cassava (M. esculenta Crantz) grown in Puerto Rico, and the rheological characteristics of their starch were determined. These included variety Pana which has a light tan skin and a dark-skinned variety known as Zenón, or Yuca Negra de Maca (Black Maca cassava), in the Dominican Republic. Proximate composition was found to be about the same for both varieties. Hydrocyanic acid content was well below the toxicity level (50 to 100 mg HCN/kg of fresh-peeled tuberous root). Although pasting temperatures were the same for both varieties (63° C), viscosity values of the starch of Pana variety were somewhat higher than those of Zenón.

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