scholarly journals Sterility caused by cooling treatment at the flowering stage in rice plants. IV. Effects of the starting time of cooling, morning and evening, and the soil temperatures and the light conditions after cooling on the fertility.

1989 ◽  
Vol 58 (4) ◽  
pp. 684-688
Author(s):  
Setsuo KOIKE ◽  
Tetsuo SATAKE
Keyword(s):  
Light Conditions ◽  
Flowering Stage ◽  
Rice Plants ◽  
Starting Time ◽  
Soil Temperatures

The effect of soil temperature and light on sprouting and rooting of root cuttings of hybrid aspen clones

2005 ◽  
Vol 35 (11) ◽  
pp. 2671-2678 ◽  
Author(s):  
N Stenvall ◽  
T Haapala ◽  
S Aarlahti ◽  
P Pulkkinen
Keyword(s):  
Soil Temperature ◽  
Populus Tremuloides ◽  
Hybrid Aspen ◽  
Light Conditions ◽  
Dark Treatment ◽  
Sand Mixture ◽  
Negative Effect ◽  
Soil Temperatures ◽  
Time Required ◽  
Better Than

Root cuttings from five clones of hybrid aspen (Populus tremula L. × Populus tremuloides Michx.) obtained from 2-year-old stock plants were grown in a peat–sand mixture (soil) at four soil temperatures (18, 22, 26, and 30 °C). Half of the cuttings were grown in light and the rest in darkness. The root cuttings that were grown at the highest soil temperature sprouted and rooted significantly better than the cuttings grown at the lower temperatures. Light did not affect the sprouting of root cuttings but did have a negative effect on their rooting. Moreover, the clones varied significantly in sprouting and rooting percentages, as well as in the time required for sprouting. In general, higher soil temperatures hastened sprouting of the cuttings. Sprouting was also faster in the light than in the dark treatment. Differences in soil temperature, light conditions, or clone had no significant effect on rooting time.

scholarly journals Effects of soil early-spring temperature on the morphometric parameters of mitochondria in Galanthus nivalis L. leaves

2018 ◽  
Vol 5 (4) ◽  
pp. 149-154 ◽  
Author(s):  
O M Fediuk ◽  
N O Bilyavska ◽  
E K Zolotareva
Keyword(s):  
Surface Layer ◽  
Soil Temperature ◽  
Soil Surface ◽  
Early Spring ◽  
Positive Temperature ◽  
Flowering Stage ◽  
Natural Conditions ◽  
Spring Temperature ◽  
Soil Temperatures ◽  
Galanthus Nivalis

In the natural conditions early-spring period development of Galanthus nivalis L., the leaves germination from bulbs was carried out in the soil surface layer, mainly, covered with snow, so the leaves were exposed to low soil temperatures. It was found, that at the leaf germination stage, when exposed to minus soil temperature, the mitochondria were predominantly elongated, that is, functionally active. Under the influence of positive temperature, the mitochondria form changed to a round one, which indicates their transition to low functional activity. A similar tendency was manifested even during the budding stage, in particular, when the soil temperature was lowered to an average of –3.47 °C, the mitochondria changed their form to an elongated one, that is, they passed into an active functional state. Wherein, the temperature of the leaves was higher by 3.84 °C compared to the soil. At the stages of germination and budding of G. nivalis under natural conditions, a direct correlation was found between the soil surface layer temperature and the leaves temperature, and at the flowering stage this relation was reverse. During the flowering stage, despite the influence of predominantly positive soil temperatures, leaves growth was significantly slowed, and their temperature was only slightly higher by 0.38 °C compared to the soil. At the same time, the mitochondria changed their shape to a round one. Thus, the increase in their long axis at different stages in spring development, are aimed at adapting to influence low temperatures of the soil surface layer.

scholarly journals Relationship of susceptibility and growth stages of plant for development of epidemic of sheath blight in rice

2010 ◽  
Vol 2 (2) ◽  
pp. 230-233 ◽  
Author(s):  
Ramji Singh ◽  
Laxmi Shankar Singh ◽  
Durga Prasad ◽  
R.S. Kureel ◽  
Rakesh Sengar ◽  
...  
Keyword(s):  
Incubation Period ◽  
Disease Severity ◽  
Sheath Blight ◽  
Growth Stages ◽  
Flowering Stage ◽  
Rice Plants ◽  
Crop Growth Stages ◽  
Relationship Of ◽  
Dough Stage ◽  
Different Growth Stages

The present paper deals with most susceptible growth stage of rice with different farms and quantitiy of inoculum for development of sheath blight of rice by Rhizoctonia solani.Among seven different growth stages of rice crop i.e. seedling, initial tillering, maximum tillering, boot leaf, panicle emergence, flowering and dough stage, the flowering stage was found to be most susceptible and highly prone for sheath blight development, while seedling stage was found to be least susceptible and with low proneness for disease development. Disease severity, number and length of lesions get increased with the increasing crop growth stages up to flowering stage and thereafter disease severity decreases with the increases in further growth stages of rice plant. Among four different growth stages of the pathogen (inoculum capacity) i.e. five days old mycelium, seven days old mycelium, milky sclerotial stage and mature sclerotial stage which were inoculated at maximum tillering stage of rice plants, five days old mycelial inoculum was found to be most virulent. Disease severity decreased and incubation period increased with further ageing of inoculum. Among five different amount of inoculum (inoculum density) i.e. 0.20 mg, 5.50 mg, 6.00 mg, 7.00 mg and 8.00 mg of sclerotial inoculum, which were inoculated at maximum tillering stage of rice plants, highest disease severity and minimum incubation period was observed with 8.00 mg amount of sclerotial inoculum. Whereas, least disease severity and longest incubation period was observed when inoculation was done with 0.2 mg of sclerotial inoculum.

scholarly journals Keanekaragaman Belalang (Orthoptera: Acrididae) padaEkosistem Sawah di Desa Banyuasin Kecamatan Riau Silip Kabupaten bangka

2021 ◽  
Vol 6 (2) ◽  
pp. 78-85
Author(s):  
Riko Irwanto ◽  
Tissya Milly Gusnia
Keyword(s):  
Soil Moisture ◽  
Quantitative Research ◽  
Sampling Method ◽  
Diversity Index ◽  
Rice Fields ◽  
Purposive Sampling ◽  
Rice Plants ◽  
Evenness Index ◽  
Soil Temperatures ◽  
Field Ecosystem

The paddy field ecosystem is a place for interactions between plants and animals, especially between rice plants and grasshoppers. Grasshoppers act as eaters of rice plants, of course, become a threat to agriculture so that they can reduce agricultural productivity. This study aims to determine the diversity of Orthoptera: Acrididae in the rice fields of Banyuasin Village, Riau Silip District, Bangka Regency and the habitat conditions of Orthoptera: Acrididae in the rice fields of Banyuasin Village, Riau Silip District, Bangka Regency. This research is a descriptive quantitative research using purposive sampling method using insect net and handsorting techniques. Measurement of environmental factors is carried out by taking data on soil temperature, soil moisture, and light intensity. The research data were analyzed using the Shannon diversity index and the evenness index. Based on observations, there were 6 types of Acrididae family found in the rice field ecosystem, namely 16 individuals of Valanga nigricornis, 12 of Xenocatantops humilis, 11 of Phlaeoba fumosa, 13 Traulia azureipennis, 9 Oxya hyla and 3 Trimerotropis pallidipenni. The analysis showed that the diversity index of grasshoppers was 1.70 which was classified as moderate criteria and the evenness index was 0.41 which was classified as moderate. The locust habitat that has been obtained has optimal soil temperatures ranging from 35oC-45oC, with 50% soil moisture. Keywords: Acrididae, diversity, Ecosystem, Orthoptera, Rice Fields ABSTRAK Ekosistem sawah merupakan tempat terjadinya interaksi antara tumbuhan dan hewan khususnya antara tumbuhan padi dan Belalang. Belalang bertindak sebagai pemakan tumbuhan padi tentunya menjadi ancaman bagi pertanian sehingga dapat menurunkan produktivitas pertanian. Penelitian ini bertujuan untuk mengetahui keanekaragaman Orthoptera:Acrididae di ekosistem sawah Desa Banyuasin Kecamatan Riau Silip Kabupaten Bangka dan  kondisi habitat Orthoptera:Acrididae di ekosistem sawah Desa Banyuasin Kecamatan Riau Silip Kabupaten Bangka. Penelitian ini berupa deskriptif kuantitatif dengan menggunakan metode purposive sampling  dengan menggunakan tehnik insect net dan handsorting. Pengukuran faktor lingkungan dilakukan dengan mengambil data suhu tanah, kelembaban tanah, dan intensitas cahaya. Data hasil penelitian dianalisis dengan menggunakan indeks keanekaragaman Shanon, dan indeks kemerataan. Berdasarkan hasil pengamatan, didapatkan sebanyak 6 jenis family Acrididae yang terdapat pada ekosistem sawah, yaitu Valanga nigricornis sebanyak 16 individu, Xenocatantops humilis berjumlah 12 individu, Phlaeoba fumosa berjumlah 11 individu, Traulia azureipennis 13 individu, Oxya hyla  berjumlah 9 individu dan Trimerotropis pallidipennis berjumlah 3 individu. Hasil analisis menunjukkan bahwa indeks keanekaragaman belalang sebesar 1,70 tergolong kriteria sedang dan indeks kemerataan sebesar 0,41 tergolong sedang. Habitat belalang yang telah didapatkan ini memiliki suhu tanah yang optimal mulai dari 35oC-45oC, dengan kelembaban tanah 50%. Kata kunci: Acrididae, Ekosistem, keanekaragaman, Orthoptera, Sawah

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