scholarly journals Effects of Straw Incorporation on Soil Nutrients, Enzymes, and Aggregate Stability in Tobacco Fields of China

2016 ◽  
Vol 8 (8) ◽  
pp. 710 ◽  
Author(s):  
Jiguang Zhang ◽  
Guodong Bo ◽  
Zhongfeng Zhang ◽  
Fanyu Kong ◽  
Yi Wang ◽  
...  
Keyword(s):  
Soil Nutrients ◽  
Aggregate Stability ◽  
Straw Incorporation

scholarly journals Effects of Organic Amendments on Soil Aggregate Stability and Microbial Biomass in a Long-Term Fertilization Experiment (IOSDV)

2021 ◽  
Vol 13 (17) ◽  
pp. 9769
Author(s):  
Gábor Csitári ◽  
Zoltán Tóth ◽  
Mónika Kökény
Keyword(s):  
Microbial Biomass ◽  
Grain Yield ◽  
Temporal Variability ◽  
Organic Amendments ◽  
Aggregate Stability ◽  
Microbial Biomass C ◽  
Organic C ◽  
Fertilization Experiment ◽  
Straw Incorporation

The effect of two types of organic amendment (manure and straw incorporation) and various doses (0–200 kg N*ha−1) of mineral N fertilization on microbial biomass C (MBC), aggregate stability (AS), soil organic C (SOC) and grain yield were investigated in an IOSDV long-term fertilization experiment (Keszthely, Hungary). This study was conducted during years 2015–2016 in a sandy loam Ramann-type brown forest soil (Eutric Cambisol according to WRB). Organic amendments had a significant effect on AS, MBC and SOC, increased their values compared to the unamended control. The organic amendments showed different effects on AS and MBC. AS was increased the most by straw incorporation and MBC by manure application. The magnitude of temporal variability of AS and MBC differed. Presumably, the different effects of organic amendments and the different degrees of temporal variability explain why there was only a weak (0.173) correlation between AS and MBC. AS did not correlate with SOC or grain yield. MBC correlated (0.339) with SOC but not with the grain yield. The N fertilizer dose did not have a significant effect on AS and MBC, but had a significant effect on SOC and grain yield.

scholarly journals PENGARUH MEDIA TANAM DAN FREKUENSI PEMBERIAN AIR TERHADAP SIFAT FISIK, KIMIA DAN BIOLOGI TANAH SERTA PERTUMBUHAN JARAK PAGAR

2020 ◽  
Vol 16 (2) ◽  
pp. 64
Author(s):  
DJAJADI DJAJADI ◽  
BAMBANG HELIYANTO ◽  
NURUL HIDAYAH
Keyword(s):  
Organic Matter ◽  
Soil Fertility ◽  
Soil Nutrients ◽  
Sandy Soil ◽  
Jatropha Curcas ◽  
Aggregate Stability ◽  
Growth Media ◽  
Sand Soil ◽  
Water Holding

<p>ABSTRAK</p><p>Lahan pertanian yang didominasi oleh partikel pasir di daerah lahankering iklim kering mempunyai kapasitas yang rendah dalam menyimpanair dan unsur hara, serta rentan terhadap erosi. Penambahan tanah liat,zeolit, dan bahan organik diharapkan dapat meningkatkan kadar unsur haratanah, kadar air tanah, dan pertumbuhan tanaman. Penelitian yangdilakukan dari bulan Mei sampai Desember 2008 ini bertujuan untukmengetahui pengaruh penambahan tanah liat, zeolit dan interaksinyadengan bahan organik terhadap stabilitas makroagregat, kadar unsur haraC, N, P, dan K, daya pegang air tanah berpasir, populasi mikroorganismetanah serta pertumbuhan jarak pagar. Media tanam yang diuji sebanyak 5jenis, yaitu (1) 100% tanah pasir, (2) 95% tanah pasir + 5% tanah liat, (3)95% tanah pasir + 5% zeolit, (4) 94,2% tanah pasir + 5% tanah liat + 0,8%bahan organik, dan (5) 94,2% tanah pasir + 5% zeolit + 0,8% bahanorganik. Untuk mengetahui kemampuan daya pegang air tanah, makaperlakuan jenis media tersebut dikombinasikan dengan perlakuanfrekuensi pemberian air, yaitu dengan interval 7 dan 21 hari sekali.Perlakuan disusun dalam rancangan acak kelompok faktorial denganempat kali ulangan. Hasil penelitian menunjukkan bahwa penambahan 5%tanah liat + 0,8% bahan organik pada tanah berpasir dapat meningkatkanproporsi makroagregat, kadar unsur hara C, N, P, dan K, serta kapasitasdaya pegang air tanah. Penambahan sebanyak 5% zeolit pada tanah pasirmeningkatkan populasi bakteri. Peningkatan populasi jamur lebih dipacudengan frekuensi pemberian air 7 hari sekali. Pertumbuhan tinggi tanamanjarak pagar juga lebih dipercepat oleh pemberian air dengan frekuensi 7hari sekali.</p><p>Kata kunci: Jatropha curcas, pasir, liat, zeolit, bahan organik, kesuburantanah, pengairan</p><p>ABSTRACT</p><p>The role of clay, zeolit, and organic matter in increasingsoil fertility of sandy soil as growth media for Jatrophacurcas</p><p>Agricultural sandy soils have low capability to retain water andnutrients. Addition of clay, zeolit and organic matter to these soils wasexpected to increase macro-aggregate stability, soil nutrients and waterholding capacity. The research had been conducted from May up toDecember 2008 to find out the effect of addition of clay, zeolit, and theirinteractions with organic matter in increasing sandy soil fertility as growthmedia for Jatropha curcas. The study had an objective to quantify theeffect of plant media and frequency of watering on soil macro-aggregatestability, soil nutrients, water holding capacity, soil microorganismspopulation, and growth of J. curcas. Plant growth media tested in thisstudy consisted of 5 types, i.e. (1) 100% sand soil, (2) 95% sand soil + 5%clay soil, (3) 95% sand soil + 5% zeolit, (4) 94.2% sand soil + 5% clay +0.8% organic matter, and (5) 94.2% sand soil + 5% zeolit + 0.8% organicmatter. Watering of plant was divided into two time intervals, i.e. each of 7days and each of 21 days. Results showed that plant media which was amixture of 94.2% sand soil + 5% clay + 0.8% organic matter increasedproportion of maco-aggregate, plant nutrients (C, N, P, K) and soil waterholding capacity. Plant media consisted of mixture of 95% sand soil + 5%zeolit was suitable for development of bacteria population. Acceleratingof growth of J curcas was induced by watering with interval of 7 days.</p><p>Key words: Jatropha curcas, sand, clay, zeolit, organic matter, watering,soil fertility</p>

scholarly journals Effects of Wheat Straw Incorporation on the Availability of Soil Nutrients and Enzyme Activities in Semiarid Areas

PLoS ONE ◽  
2015 ◽  
Vol 10 (4) ◽  
pp. e0120994 ◽  
Author(s):  
Ting Wei ◽  
Peng Zhang ◽  
Ke Wang ◽  
Ruixia Ding ◽  
Baoping Yang ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Soil Nutrients ◽  
Enzyme Activities ◽  
Semiarid Areas ◽  
Straw Incorporation

Lack of Stability of Aggregates after Thrombin-Induced Reaggregation of Thrombin-Degranulated Platelets

1992 ◽  
Vol 67 (04) ◽  
pp. 453-457 ◽  
Author(s):  
Raelene L Kinlough-Rathbone ◽  
Marian A Packham ◽  
Dennis W Perry ◽  
J Fraser Mustard ◽  
Marco Cattaneo
Keyword(s):  
Von Willebrand Factor ◽  
Platelet Rich Plasma ◽  
Thrombus Formation ◽  
Aggregate Stability ◽  
Relative Importance ◽  
Platelet Aggregates ◽  
The Stability ◽  
Von Willebrand ◽  
Induced Aggregation ◽  
Willebrand Factor

SummaryThe stability of platelet aggregates is influenced by the extent of the release of granule contents; if release is extensive and aggregation is prolonged, deaggregation is difficult to achieve. The relative importance of the contributions of released substances to aggregate stability are not known, although stable thrombin-induced aggregates form in platelet-rich plasma from patients with barely detectable plasma or platelet fibrinogen, and ADP stabilizes thrombin-induced aggregates of platelets from patients with delta storage pool deficiency which otherwise deaggregate more readily than normal platelets. We degranulated platelets with thrombin (0.9 U/ml caused greater than 90% loss of delta and alpha granule contents) and recovered them as individual platelets in fresh medium. The degranulated platelets were reaggregated by thrombin (2 U/ml). To prevent continuing effects of thrombin, FPRCH2C1 was added when thrombin-induced aggregation of thrombin-degranulated platelets reached its maximum. EDTA (5 mM) or EGTA (5 mM) added at maximum aggregation did not deaggregate these platelets, indicating that the stability of these aggregates does not depend on Ca2+ in the medium. Whereas with control platelets a combination of PGE1 (10 μM) and chymotrypsin(10 U/ml) was required for deaggregation, with thrombin-degranulated platelets either PGE1 or chymo-trypsin alone caused extensive deaggregation. The rate and extent of deaggregation of thrombin-degranulated platelets by a combination of PGE1 and chymotrypsin was greater than with control platelets.Electron microscope gold immunocytochemistry using antihuman fibrinogen IgG, anti-von Willebrand factor and anti-fibronectin showed a) that fibrinogen in the vacuoles of degranulated platelets was visible at focal points of platelet contact in the aggregates, but that large areas of platelet contact had no fibrinogen detectable between them; and b) in comparison to fibrinogen, little fibronectin or von Willebrand factor (vWf) was detectable in the platelets.Since the linkages between thrombin-degranulated platelets reaggregated by thrombin can be disrupted either by raising cAMP (thus making glycoprotein IIb/IIIa unavailable) or by proteolysis, these linkages are less stable than those formed between normal platelets. It might therefore be expected that platelets that take part in thrombus formation and then recirculate are likely to form less stable thrombi than platelets that have not released their granule contents.

Lowland Rice Yield as Affected by Straw Incorporation and Inorganic Fertilizer Over Cropping Seasons in Fluvisol

2014 ◽  
Vol 3 (1) ◽  
pp. 129-141
Author(s):  
Brahima Koné ◽  
Zadi Florent ◽  
Gala bi Trazié Jeremie ◽  
Akassimadou Edja Fulgence ◽  
Konan Kouamé Firmin ◽  
...  
Keyword(s):  
Grain Yield ◽  
Rice Variety ◽  
Mineral Fertilizer ◽  
Lowland Rice ◽  
Inorganic Fertilizer ◽  
Cropping Season ◽  
Significant Difference ◽  
Straw Incorporation ◽  
Cropping Seasons ◽  
Fertilizer Effect

Grain yield stabilization of lowland rice over cropping seasons was explored using different compositions of inorganic fertilizers (NPK, NPKCa, NPKMg, NPKZn, NPKCaMg, NPKCaZn and NPKCaMgZn) and straw incorporation (3, 6, 9, 12 and 15 tha-1 ). No fertilizer and no straw amended plot was the control in a split-plot design with three replications laid in a Fluvisol of Guinea savanna in Centre Cote d’Ivoire. Three weeks old nursery rice variety NERICA L19 was transplanted. No significant difference of grain yield was observed between the different treatments excluding the highest yields recorded for treatments NPKMg (5.09 tha-1 ), NPKZn (5.15 tha-1 ) and NPKCaéMg (5.31 tha-1 ) compared with 12 (3.95 tha1 ) and 15 tha-1 (4.14 tha-1 ) as straw rates respectively. Grain yield declining trend was more pronounced for mineral fertilizer treatments showing twice greater depressive effect of cropping cycle compared with the straw especially, for treatments characterized by highest grain yield in the first cropping season and similar grain yields were recorded for both sources of nutrient in the third cropping cycle. Of slowness of nutrients releasing by straw, highest grain yield was expected for this soil amender within a longer period of cultivation whereas, unbalance soil micronutrients should be relevant to studious declining yield under inorganic fertilizer effect. Nevertheless, the straw rate of 12 tha-1 supplying 0.58% of NPK as mineral fertilizer equivalent can be recommended for sustaining lowland rice production in the studied agro-ecosystems unless for three cropping seasons.

PETANI KUNINGAN DALAM PUSARAN KONFLIK KELAS

1970 ◽  
Vol 13 (2) ◽  
Author(s):  
Nanang Susanto
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Action Research ◽  
Participatory Action Research ◽  
Soil Nutrients ◽  
Qualitative Approach ◽  
Participatory Action ◽  
Cost Of Production ◽  
Depth Interviews ◽  
Participatory Observation

Penelitian ini menguji teori Marx yang mengatakan bahwa dalam proses kapitalisasi, petani lahan kecil akan tergusur oleh petani lahan besar. Penelitian ini menggunakan pendekatan kualitatif dengan metode Participatory Action Research (PAR). Menggunakan teknik observasi partisipasi di lapangan, studi ini melakukan wawancara mendalam terhadap petani. Analisis data yang digunakan bersifat induktif. Penelitian ini menghasilkan kesimpulan, bahwa teori Marx tidak terjadi di malar Aman. Adapun penyebab menurunnya pertanian disebabkan menurunnya unsur hara tanah, mahalnya biaya produksi, alih fungsi lahan dan perubahan cuaca. Sedangkan strategi petani lahan kecil untuk mempertahankan kehidupan yaitu melakukan pola tanam tumpang sari, melakukan pekerjaan tambahan, dan mengatur keuangan.This study examines Marx's theory which says that in the process of capitalization, small land farmers will be displaced by large land farmers. This study uses a qualitative approach with the method of Participatory Action Research (PAR). Using the techniques of participatory observation in the field, the study conducted in-depth interviews on farmers. Analysis of the data used is inductive. This study led to the conclusion that Marx's theory does not happen in Aman malar. The cause of the decline of agriculture due to declining soil nutrients, the high cost of production, land use and climate change. While the strategies of small land farmers to sustain life is to do the planting patterns of intercropping, do extra work, and manage finances.

Sign in / Sign up

Export Citation Format

Share Document