Experimental studies on seed production of tropical grasses in Kenya. 3. The effect of nitrogen and row width on seed crops of Setaria sphacelata cv. Nandi II.

Boonman, Joseph G.

doi:10.18174/njas.v20i1.17295

Cited by 5 publications

(16 citation statements)

References 5 publications

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“…R did the same but the effect was less pronoun ced. In the experiments on Nandi previously described (Boonman, 1972) numbers at IHE were highest at medium N.…”

Section: Post-establishment Cropsmentioning

confidence: 81%

“…This paper is confined to reporting on important comparisons and points of differen ce with the previous paper (Boonman, 1972). The data for the establishment crop har vested in December 1968 are presented in Table 1, while Table 2 shows the averages of the six post-establishment crops.…”

Section: Resultsmentioning

confidence: 99%

“…The design, treatments and operations were the same as those described for Experiment II of my previous paper (Boonman, 1972). Both experiments ran concurrently.…”

Section: Methodsmentioning

confidence: 99%

“…In my previous paper (Boonman, 1972) it was shown that adequate nitrogen (N) and close row width (R) increased yield of Pure Germinating Seed (PGS) considerably in Setaria sphacelata cv. Nandi II.…”

Section: Introductionmentioning

confidence: 99%

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Experimental studies on seed production of tropical grasses in Kenya. 4. The effect of fertilizer and planting density on Chloris gayana cv. Mbarara.

Boonman¹

1972

NJAS

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Rhodes grass sown broadcast or in rows 25-100 cm apart at 0.2-1.8 kg pure germinable seed/ha was given 0-80 kg seedbed P2O5 and 0-200 kg N/ha for each seed crop. Yields of DM in the establishment year were significantly higher at high seed rates and close spacing, whereas yields of clean seed were decreased from 145 kg/ha (50-cm rows) at the lowest seed rate to 110 kg/ha at the highest. Seed yields were highest, 160 kg/ha, from broadcast sowings at 1 kg/ha. Yields of pure germinable seed were not significantly affected by treatment. In 6 seed crops taken after establishment, the only factor of importance for seed yield was N; yields of pure germinable seed increased from 6.2 kg/ha without N to 36.7-41.0 kg/ha at 100 kg N/ha and 41.2-43.2 kg/ha at 150 kg N/ha. DM yields from these 6 crops were higher at the wider row spacings. Increased N and wider spacing accelerated the onset of heading. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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“…R did the same but the effect was less pronoun ced. In the experiments on Nandi previously described (Boonman, 1972) numbers at IHE were highest at medium N.…”

Section: Post-establishment Cropsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

“…The design, treatments and operations were the same as those described for Experiment II of my previous paper (Boonman, 1972). Both experiments ran concurrently.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental studies on seed production of tropical grasses in Kenya. 4. The effect of fertilizer and planting density on Chloris gayana cv. Mbarara.

Boonman¹

1972

NJAS

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“…Several studies have shown the advantages of row planting over broadcasting for grass seed production, mainly because of efficient utilization of sunlight, soil nutrients and water. Boonman (1972) showed that the seed yield of Setaria sphacelata cv. Nandi II from broadcast sowing was lower than that for row planting using 50-cm-row widths and applying 100 kgN/ha.…”

mentioning

confidence: 99%

Effects of plant spacing on seed yield and seed quality in new Urochloa cultivars

Juntasin

Imura

Thaikua³

et al. 2021

Grassland Science

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Urochloa (syn. Brachiaria) cultivars are widely used as forage for ruminants in tropical countries and also in Thailand. Two new Urochloa cultivars, OKI-1 and Br-203, have high forage yield and digestibility compared with other cultivated Urochloa grasses. Seed production is a fundamental requirement for widespread sowing, and it can be increased by optimizing agronomic practices, such as changing plant spacing. Two field trials were conducted in 2018-2020 at Lampang Animal Nutrition Research and Development Center, Northern Thailand, to determine the optimal plant spacing for seed production of these Urochloa cultivars. In both trials, four plant-spacing regimes (50 Â 100, 75 Â 100, 100 Â 100 and 125 Â 100 cm) were used in a randomized complete block design with four replicates. In two consecutive harvests of both trials, plant spacing did not significantly affect seed yield and quality but affected tiller and inflorescence densities. Specifically, significant higher numbers of tillers and inflorescences were produced per unit area at the narrowest plant spacing (i.e., 50 Â 100 cm). OKI-1 and Br-203 tended to have higher pure seed yields (PSY) at plant spacings of 100 Â 100 (136.46 kg/ha) and 75 Â 100 cm (79.59 kg/ha), respectively. Both cultivars showed similar trends in PSY, filled seed percentage and a thousand seed weight, which tended to be higher in the first-year crops than the secondyear crops. This difference could be attributed to a reduction in available soil N resulting from a large amount of N utilization during vegetative growth, combined with inadequate and erratic rainfall. In addition to the recommended optimum plant spacing, sufficient fertilizer and suitable environmental factors could increase seed yield.

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A Study on Identification of Agronomical Methods for Raising Seed Production in Buffel Grass (Cenchrus ciliaris)

Singh

Dwivedi

Sinha

1988

J Agronomy Crop Science

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Field trials were conducted at Indian Grassland and Fodder Research Institute, Jhansi to find out appropriate agronomical technique, as method of planting, sowing date, time and dose of nitrogen application and synergistic effect of companion crops. Results demonstrated that (i) six weeks old seedlings of Cenchrus ciliaris have good vigour potential for vegetative propagation, (ii) its planting is most appropriate in last week of June, (iii) it requires 80 kg N in split doses (40 kg N at sowing and 40 kg N 30 days after sowing) and (iv) seed yielding potential of Cenchrus ciliaris further increased with companion crop of Sesame (Sesamum indicum). Thus it is pointed out that these agronomical requirement is necessary for reaping potential seed yield of Cenchrus ciliaris.

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Experimental studies on seed production of tropical grasses in Kenya. 3. The effect of nitrogen and row width on seed crops of Setaria sphacelata cv. Nandi II.

Cited by 5 publications

References 5 publications

Experimental studies on seed production of tropical grasses in Kenya. 4. The effect of fertilizer and planting density on Chloris gayana cv. Mbarara.

Experimental studies on seed production of tropical grasses in Kenya. 4. The effect of fertilizer and planting density on Chloris gayana cv. Mbarara.

Effects of plant spacing on seed yield and seed quality in new Urochloa cultivars

A Study on Identification of Agronomical Methods for Raising Seed Production in Buffel Grass (Cenchrus ciliaris)

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